.calculator-container {
    position: relative;
    background-color: transparent; /* Dark background */
    color: #00ff00; /* Bright green text */
    display: flex;
    justify-content: center;
    align-items: center;
    height: 101vh;
  }
  .heading {
    position: fixed;
    top: 20px;
    left: 50%;
    transform: translateX(-50%);
    color: #00ff00; /* Black color */
    text-decoration: none;
    transition: color 0.3s ease; /* Added transition */
  }
  
  .heading:hover {
    color: #0cf12b; opacity: 0.4;/* Bright green on hover */
    text-decoration: underline; /* Underline on hover */
  }
  .theme-toggle {
    position: absolute;
    top: 10px;
    right: 10px;
  }
  
  .switch {
    position: relative;
    display: inline-block;
    width: 60px;
    height: 34px;
  }
  
  .switch input { 
    opacity: 0;
    width: 0;
    height: 0;
  }
  
  .slider {
    position: absolute;
    cursor: pointer;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-color: #777;
    -webkit-transition: .4s;
    transition: .4s;
    border-radius: 34px;
  }
  
  .slider:before {
    position: absolute;
    content: "";
    height: 26px;
    width: 26px;
    left: 4px;
    bottom: 4px;
    background-color: white;
    -webkit-transition: .4s;
    transition: .4s;
    border-radius: 50%;
  }
  
  input:checked + .slider {
    background-color: #00ff00;
  }
  
  input:checked + .slider:before {
    -webkit-transform: translateX(26px);
    -ms-transform: translateX(26px);
    transform: translateX(26px);
  }
  
  .calculator {
    width: 300px;
    background-color: #333; opacity: 0.8;/* Dark gray */
    border-radius: 8px;
    padding: 20px;
  }
  
  .display {
    background-color: #1a1a1a;
    color: #00ff00;
    text-align: right;
    padding: 10px;
    font-size: 24px;
    border-radius: 4px;
    margin-bottom: 10px;
  }
  
  .buttons {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 10px;
  }
  
  button {
    background-color: #444; /* Dark gray */
    color: #00ff00;
    border: none;
    padding: 15px;
    font-size: 18px;
    cursor: pointer;
    border-radius: 4px;
    transition: background-color 0.3s ease;
  }
  
  button:hover {
    background-color: black; /* Dark gray on hover */
  }
   .live-background video{ position: absolute; right: 0; bottom: 0; z-index: -1; }  @media(min-aspect-ratio:16/9){.live-background  video {width: 150%; height: auto; }}  
   /* .live-background video{ position: absolute; right: 0; bottom: 0; z-index: -1; }  @media(min-aspect-ratio:16/9){.  video {width: 100%; height: auto; }}   */