style.css

* {
    box-sizing: border-box;
  }
  
  body {
    margin: 0;
    font-family: Arial, Helvetica, sans-serif;
    display: flex;
    justify-content: center;
    align-items: center;
    height: 100vh;
  }
  
  .background {
    position: fixed;
    width: 100%;
    height: 100%;
    top: 0;
    left: 0;
    background: linear-gradient(to bottom right, #00d2ff, #3a7bd5, #7742B2, #CC0099, #FDB813);
    background-size: 400% 400%;
    animation: gradient 15s ease infinite;
    z-index: -1;
  }
  
  .container {
    width: 100%;
    display: flex;
    justify-content: center;
  }
  
  .clock {
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    padding: 1.5rem;
    border-radius: 2rem;
    background-color: #e5e5e5;
    box-shadow: 0px 0px 10px rgba(0, 0, 0, 0.2);
  }
  
  .time-wrapper {
    display: flex;
    justify-content: center;
    align-items: center;
  }
  
  .time {
    font-size: 3rem;
    font-weight: bold;
    padding: 0.5rem;
    margin: 0.5rem;
    border-radius: 1rem;
    background-color: #fff;
    color: #141414;
    text-shadow: 0px 0px 10px rgba(0, 0, 0, 0.2);
  }
  
  .time-separator {
    font-size: 3rem;
    font-weight: bold;
    padding: 0.5rem;
    margin: 0.5rem;
    color: #141414;
  }
  
  .timezone {
    font-size: 1.2rem;
    font-weight: bold;
    margin-top: 0.5rem;
    text-align: center;
    color: #fff;
    text-shadow: 0px 0px 10px rgba(0, 0, 0, 0.2);
  }
  
  .toggle-button {
    font-size: 1.2rem;
    font-weight: bold;
    padding: 1rem 2rem;
    border-radius: 1rem;
    background-color: #fff;
    color: #141414;
    text-shadow: 0px 0px 10px rgba(0, 0, 0, 0.2);
    box-shadow: 0px 0px 10px rgba(0, 0, 0, 0.2);
    transition: all 0.3s ease;
    margin-top: 1.5rem;
  }
  
  .toggle-button:hover {
    cursor: pointer;
    background-color: #f2f2f2;
  }
  
  .toggle-button:active {
    background-color: #e6e6e6;
  }
  
  @media only screen and (max-width: 768px) {
    .time {
      font-size: 2rem;
      padding: 0.3rem;
      margin: 0.3rem;
      border-radius: 0.5rem;
    }
  
    .time-separator {
      font-size: 2rem;
      padding: 0.3rem;
      margin: 0.3rem;
    }
  
    .timezone {
      font-size: 1rem;
    }
  
    .toggle-button {
      font-size: 1rem;
      padding: 0.5rem 1rem;
    }
  }

  @keyframes gradient {
    0% {
    background-position: 0% 50%;
    }
    50% {
    background-position: 100% 50%;
    }
    100% {
    background-position: 0% 50%;
    }
}