CSS animated order confirmation | HTML, CSS & JavaScript

:root {
    --cart-primary: #4f46e5;   /* Indigo */
    --cart-hover: #4338ca;
    --cart-success: #059669;   /* Emerald */
    --text-color: #ffffff;
  }
  body {
    margin: 25% 30%;
  }
  
  .cart-btn {
    position: relative;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    width: 180px;
    height: 48px;
    background-color: var(--cart-primary);
    color: var(--text-color);
    border: none;
    border-radius: 8px;
    font-size: 16px;
    font-weight: 600;
    cursor: pointer;
    overflow: hidden;
    transition: background-color 0.3s ease, transform 0.1s ease;
  }
  
  .cart-btn:hover {
    background-color: var(--cart-hover);
  }
  
  .cart-btn:active {
    transform: scale(0.96); /* Small click press effect */
  }
  
  .cart-icon {
    width: 20px;
    height: 20px;
    z-index: 2;
    transition: transform 0.3s ease;
  }
  
  .btn-text, .btn-success-text {
    transition: transform 0.4s ease, opacity 0.4s ease;
  }
  
  .btn-success-text {
    position: absolute;
    opacity: 0;
    transform: translateY(20px); /* Starts hidden below */
  }
  
  /* The box that drops into the cart */
  .cart-item {
    position: absolute;
    width: 10px;
    height: 10px;
    background-color: #fca5a5; /* Light red/pink box */
    border-radius: 2px;
    top: -20px;
    left: 36px;
    opacity: 0;
    z-index: 1;
  }
  
  .cart-btn.is-adding {
    pointer-events: none;
  }
  .cart-btn.is-adding .cart-item {
    animation: dropItem 0.6s cubic-bezier(0.55, 0.085, 0.68, 0.53) forwards;
  }
  .cart-btn.is-adding .cart-icon {
    animation: catchBump 0.3s ease-out 0.4s forwards;
  }
  .cart-btn.is-added {
    background-color: var(--cart-success);
    pointer-events: none;
  }
  .cart-btn.is-added .btn-text {
    opacity: 0;
    transform: translateY(-20px); /* Slide text up and out */
  }
  .cart-btn.is-added .btn-success-text {
    opacity: 1;
    transform: translateY(0); /* Slide success text in */
  }

@keyframes dropItem {
    0%   { top: -20px; opacity: 0; transform: scale(1); }
    20%  { opacity: 1; }
    80%  { top: 22px; opacity: 1; transform: scale(1); }
    100% { top: 22px; opacity: 0; transform: scale(0); } /* Disappears into cart */
  }
  
  @keyframes catchBump {
    0%   { transform: translateY(0); }
    50%  { transform: translateY(4px) scaleY(0.9); }
    100% { transform: translateY(0); }
  }

- CSS animated order confirmation

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