body, html {
      margin: 0;
      padding: 0;
      height: 100%;
      overflow: scroll;
    }

    #canvas-wrapper {
      position: relative;
      margin: 0;
      width: 100vw;
      height: 100vh;
      background: #fff;
      border: 2px solid #000;
    }

    canvas {
      width: 100%;
      height: 100%;
      touch-action: none;
      display: block;
      cursor: crosshair;
    }

    #tools {
      top: 10px;
      left: 10px;
      background: rgba(255,255,255,0.8);
      padding: 10px;
      border-radius: 8px;
    }



  /* ============= */

  body {
      font-family: sans-serif;
      display: flex;
      flex-direction: column;
      align-items: center;
      justify-content: center;
      height: 100vh;
      margin: 0;
      height: 100vh;
      background: linear-gradient(270deg, #ff00cc, #3333ff, #00ffcc, #ffcc00);
      background-size: 800% 800%;
      animation: gradientShift 20s ease infinite;
      position: relative;
    }
    input, button {
      margin: 10px;
      padding: 10px;
      font-size: 16px;
      background-color: ;
      border-bottom:1px solid red;
    }

    .bubble {
      position: absolute;
      width: 30px;
      height: 30px;
      border-radius: 50%;
      pointer-events: none;
      animation: fadeOut 1s ease-out forwards;
    }

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

    .bubble {
      position: absolute;
      width: 30px;
      height: 30px;
      border-radius: 50%;
      pointer-events: none;
      animation: fadeOut 1s ease-out forwards;
      filter: blur(2px);
    }

    @keyframes fadeOut {
      0% {
        transform: scale(1);
        opacity: 1;
      }
      100% {
        transform: scale(2);
        opacity: 0;
      }
    }