Embossed login signup UI with electric border animation | HTML, CSS & JavaScript

<div class="form-panel login-panel">
    <div class="logo">
        🔐
    </div>
    <h1>
        Welcome
    </h1>
    <p class="subtitle">
        Login to continue your journey
    </p>

<form>
        
        <div class="input-group">
            
            <div class="electric-glow"></div>
            <div class="electric-border"></div>
            <input
                type="email"
                id="loginEmail"
                placeholder=" "
                autocomplete="email"
                required>
            <label for="loginEmail">
                Email Address
            </label>
        </div>

<div class="input-group">
            <div class="electric-glow"></div>
            <div class="electric-border"></div>
            <input
                type="password"
                id="loginPassword"
                placeholder=" "
                autocomplete="current-password"
                required>
            <label for="loginPassword">
                Password
            </label>
            <button
                type="button"
                class="password-toggle"
                onclick="togglePassword('loginPassword',this)">
                👁
            </button>
        </div>
        <div class="options">
            <label class="checkbox">
                <input type="checkbox">
                Remember me
            </label>
            <a href="#">
                Forgot Password?
            </a>
        </div>
        <button
            type="submit"
            class="main-btn">
            LOGIN
        </button>
    </form>

<div class="switch-area">
        <span>
            Don't have an account?
        </span>
        <button
            type="button"
            class="switch-circle"
            onclick="flipCard()">
            +
        </button>
    </div>

<div class="form-panel signup-panel">
    <div class="logo">
        ✨
    </div>
    <h1>
        Create Account
    </h1>
    <p class="subtitle">
        Start your journey with us
    </p>
    <form>
        
        <div class="input-group">

<div class="input-group">
            <div class="electric-glow"></div>
            <div class="electric-border"></div>
            <input
                type="email"
                id="signupEmail"
                placeholder=" "
                autocomplete="email"
                required>
            <label for="signupEmail">
                Email Address
            </label>
        </div>

<div class="input-group">
            <div class="electric-glow"></div>
            <div class="electric-border"></div>
            <input
                type="password"
                id="signupPassword"
                placeholder=" "
                autocomplete="new-password"
                required>
            <label for="signupPassword">
                Password
            </label>
            <button
                type="button"
                class="password-toggle"
                onclick="togglePassword('signupPassword',this)">
                👁
            </button>
        </div>

<div class="input-group">
            <div class="electric-glow"></div>
            <div class="electric-border"></div>
            <input
                type="password"
                id="confirmPassword"
                placeholder=" "
                autocomplete="new-password"
                required>
            <label for="confirmPassword">
                Confirm Password
            </label>
        </div>

<button
            type="submit"
            class="main-btn">
            CREATE ACCOUNT
        </button>
    </form>

<div class="switch-area">
        <span>
            Already have an account?
        </span>
        <button
            type="button"
            class="switch-circle"
            onclick="flipCard()">
            ←
        </button>
    </div>

@import url('https://fonts.googleapis.com/css2?family=Inter:wght@400;500;600;700&display=swap');

/*   RESET  */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    font-family: "Inter", sans-serif;
    background: #e7ebf0;
    overflow: hidden;
    scale: 0.7;
}

/*    BACKGROUND */

.bg-circle {
    position: fixed;
    border-radius: 50%;
    background: #e7ebf0;
    box-shadow:
        15px 15px 30px rgba(163,177,198,.55),
        -15px -15px 30px rgba(255,255,255,.9);
    z-index: -5;
    animation: floating 6s ease-in-out infinite;
}

.bg1 {
    width: 190px;
    height: 190px;
    top: 7%;
    left: 7%;
}

.bg2 {
    width: 130px;
    height: 130px;
    right: 8%;
    bottom: 8%;
    animation-delay: 1.5s;
}

.bg3 {
    width: 55px;
    height: 55px;
    right: 20%;
    top: 22%;
    animation-delay: 3s;
}

@keyframes floating {
    0%,100% {
        transform: translateY(0);
    }
    50% {
        transform: translateY(-18px);
    }
}

/*  AUTH WRAPPER */

.auth-wrapper {
    width: 400px;
    max-width: 92%;
    perspective: 1600px;
}

/*  CARD  */

.auth-card {
    position: relative;
    width: 100%;
    min-height: 610px;
    transform-style: preserve-3d;
    transition:
        transform 1s cubic-bezier(.68,-0.55,.27,1.55);
}

.auth-card.flipped {
    transform: rotateY(180deg);
}

/*  PANEL */
.form-panel {
    position: absolute;
    inset: 0;
    padding: 40px 38px;
    border-radius: 35px;
    background: #e7ebf0;
    box-shadow:
        20px 20px 40px rgba(163,177,198,.65),
        -20px -20px 40px rgba(255,255,255,.95);
    backface-visibility: hidden;
}

.signup-panel {
    transform: rotateY(180deg);
}

/*   LOGO */

.logo {
    width: 86px;
    height: 86px;
    margin: 0 auto 18px;
    display: flex;
    justify-content: center;
    align-items: center;
    border-radius: 50%;
    font-size: 30px;
    color: #087cff;
    background: #e7ebf0;
    box-shadow:
        9px 9px 18px rgba(163,177,198,.65),
        -9px -9px 18px rgba(255,255,255,.95);
    transition: .4s ease;
}

.logo:hover {
    transform:
        translateY(-5px)
        rotate(8deg);
}

/*  HEADING */

h1 {
    text-align: center;
    font-size: 27px;
    color: #303943;
    margin-bottom: 7px;
}

.subtitle {
    text-align: center;
    color: #7c858e;
    font-size: 13px;
    margin-bottom: 30px;
}

/*  INPUT GROUP  */
.input-group {
    position: relative;
    width: 100%;
    height: 58px;
    margin-bottom: 19px;
}

/*  ELECTRIC BORDER   */

.electric-border {
    position: absolute;
    inset: -2px;
    border-radius: 19px;
    overflow: hidden;
    pointer-events: none;
    opacity: 0;
    transition: opacity .2s ease;
}

/* rotating light */

.electric-border::before {
    content: "";
    position: absolute;
    width: 170%;
    height: 170%;
    left: -35%;
    top: -35%;
    background:
        conic-gradient(
            from 0deg,
            transparent 0deg,
            transparent 30deg,
            #00eaff 45deg,
            #00aaff 65deg,
            #006cff 80deg,
            transparent 105deg,
            transparent 360deg
        );
    animation:
        electricRotate 1.1s linear infinite;
}

/* inner mask */

.electric-border::after {
    content: "";
    position: absolute;
    inset: 2px;
    border-radius: 17px;
    background: #e7ebf0;
}

.electric-glow {
    position: absolute;
    inset: -4px;
    border-radius: 21px;
    pointer-events: none;
    opacity: 0;
    filter: blur(7px);
}

.input-group:focus-within .electric-border {
    opacity: 1;
}

.input-group:focus-within .electric-glow {
    opacity: .55;
    animation:
        electricRotate 1.1s linear infinite;
}

@keyframes electricRotate {
    from {
        transform: rotate(0deg);
    }
    to {
        transform: rotate(360deg);
    }
}

.input-group input {
    position: absolute;
    inset: 2px;
    width: calc(100% - 4px);
    height: 54px;
    border: none;
    outline: none;
    border-radius: 16px;
    background: #e7ebf0;
    color: #303943;
    font-family: "Inter", sans-serif;
    font-size: 14px;
    padding:
        0 48px 0 18px;
    z-index: 20;
    box-shadow:
        inset 6px 6px 12px rgba(163,177,198,.55),
        inset -6px -6px 12px rgba(255,255,255,.95);
    transition:
        box-shadow .25s ease;
}

/* input focus */

.input-group input:focus {
    box-shadow:
        inset 3px 3px 7px rgba(163,177,198,.55),
        inset -3px -3px 7px rgba(255,255,255,.95);
}

/*   LABEL  */

.input-group label {
    position: absolute;
    left: 18px;
    top: 20px;
    z-index: 30;
    color: #89929c;
    font-size: 13px;
    pointer-events: none;
    transition:
        all .25s ease;
}

/* floating label */

.input-group input:focus + label,
.input-group input:not(:placeholder-shown) + label {
    top: -8px;
    left: 13px;
    padding: 2px 8px;
    border-radius: 7px;
    background: #e7ebf0;
    color: #0072ff;
    font-size: 10px;
    line-height: 14px;
    white-space: nowrap;
}

/*  PASSWORD ICON  */

.password-toggle {
    position: absolute;
    right: 14px;
    top: 15px;
    width: 28px;
    height: 28px;
    display: flex;
    align-items: center;
    justify-content: center;
    border: none;
    background: transparent;
    color: #7d8790;
    cursor: pointer;
    z-index: 40;
    font-size: 16px;
}

.password-toggle:hover {
    color: #0072ff;
    transform: scale(1.1);
}

/*  OPTIONS  */

.options {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin:
        5px 3px 24px;
    color: #7d8790;
    font-size: 11px;
}

.checkbox {
    display: flex;
    align-items: center;
    gap: 7px;
}

.checkbox input {
    accent-color: #0072ff;
}

.options a {
    color: #0072ff;
    text-decoration: none;
}

/*  MAIN BUTTON  */

.main-btn {
    position: relative;
    isolation: isolate;
    width: 100%;
    height: 55px;
    border: none;
    border-radius: 17px;
    background: #e7ebf0;
    color: #0072ff;
    font-family: "Inter", sans-serif;
    font-size: 14px;
    font-weight: 700;
    letter-spacing: .4px;
    cursor: pointer;
    overflow: hidden;
    box-shadow:
        8px 8px 16px rgba(163,177,198,.65),
        -8px -8px 16px rgba(255,255,255,.95);
    transition:
        .3s ease;
}

/* hover background */

.main-btn::before {
    content: "";
    position: absolute;
    inset: 0;
    background:
        linear-gradient(
            110deg,
            #006cff,
            #00cfff,
            #006cff
        );
    background-size: 200% 100%;
    transform: translateY(100%);
    transition:
        transform .35s ease;
    z-index: -1;
}

.main-btn:hover::before {
    transform: translateY(0);
    animation:
        buttonMove 1.5s linear infinite;
}

@keyframes buttonMove {
    from {
        background-position: 0 50%;
    }
    to {
        background-position: 200% 50%;
    }
}

.main-btn:hover {
    color: #fff;
    transform:
        translateY(-3px);
    box-shadow:
        0 10px 25px rgba(0,114,255,.35);
}

.main-btn:active {
    transform:
        scale(.97);
}

/*  SWITCH CIRCLE  */

.switch-area {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 12px;
    margin-top: 27px;
    font-size: 11px;
    color: #7d8790;
}

.switch-circle {
    width: 49px;
    height: 49px;
    border: none;
    border-radius: 50%;
    background: #e7ebf0;
    color: #0072ff;
    font-size: 22px;
    cursor: pointer;
    display: flex;
    justify-content: center;
    align-items: center;
    box-shadow:
        7px 7px 14px rgba(163,177,198,.65),
        -7px -7px 14px rgba(255,255,255,.95);
    transition:
        .35s ease;
}

.switch-circle:hover {
    color: white;
    background: #0072ff;
    transform:
        rotate(180deg)
        scale(1.08);
    box-shadow:
        0 8px 25px rgba(0,114,255,.35);
}

.switch-circle:active {
    transform:
        scale(.9);
}

/*  SOCIAL  */

.social {
    display: flex;
    justify-content: center;
    gap: 14px;
    margin-top: 22px;
}

.social button {
    width: 40px;
    height: 40px;
    border: none;
    border-radius: 50%;
    background: #e7ebf0;
    color: #707a84;
    cursor: pointer;
    box-shadow:
        5px 5px 10px rgba(163,177,198,.55),
        -5px -5px 10px rgba(255,255,255,.9);
    transition:
        .3s ease;
}

.social button:hover {
    background: #0072ff;
    color: white;
    transform:
        translateY(-4px);
}

/*  RESPONSIVE  */

@media(max-width:480px) {
    .auth-wrapper {
        width: 94%;
    }
    .form-panel {
        padding: 35px 24px;
    }
    .auth-card {
        min-height: 580px;
    }
    h1 {
        font-size: 24px;
    }
    .logo {
        width: 78px;
        height: 78px;
    }
}

function flipCard() {
    const card =
        document.getElementById("authCard");
    card.classList.toggle("flipped");
}

/* PASSWORD SHOW / HIDE */

/*    DEMO SUBMIT  */

document
    .querySelectorAll("form")
    .forEach(form => {
        form.addEventListener(
            "submit",
            function(e) {
                e.preventDefault();
                const button =
                    this.querySelector(".main-btn");
                const oldText =
                    button.textContent;
                button.textContent =
                    "✓ SUCCESS";
                setTimeout(() => {
                    button.textContent =
                        oldText;
                }, 1800);
            }
        );
    });

- Embossed login signup UI with electric border animation

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