:root {
    --sk-color: #2F635E; /*#333*/
}

html,
body,
#heading {
    padding: 0;
    margin: 0;
    height: 100%;
    width: 100%;
}

.header {
    text-align: left;
    margin: auto;
    height: 44px;
    display: flex;
    align-items: center;
    font-weight: bolder;
    font-size: 30pt;
    overflow: hidden;
    font-family: Arial, Helvetica, sans-serif;
    color: white;
    text-shadow: 3px 3px 3px black;
    background: rgb(43, 113, 111);
}

.header img {
    height: 30px;
    margin: 0 5px 0 5px;
    align-items: flex-start;
    background-color: white;
}

#viewDiv {
    padding: 0;
    margin: 0;
    height: calc(100% - 44px);
    width: 100%;
}

.slider-container {
  position: absolute;
  bottom: 20px;
  left: 50%;
  transform: translateX(-50%);
  background: linear-gradient(145deg, #ffffff, #2B716F);
  padding: 15px;
  border: 1px solid #ddd;
  border-radius: 20px;
  box-shadow: 0 4px 15px rgba(133, 131, 131, 0.15);
  width: 300px;
  height: auto;
  max-height: 120px;
  text-align: center;
  font-family: 'Arial', sans-serif;
  font-size: 14px;
  z-index: 1000;
  color: #333;
}

.slider-container label {
  display: block;
  margin-bottom: 10px;
  font-weight: bold;
  font-size: 16px;
  color: #555;
}

.slider-container input[type="range"]::-webkit-slider-thumb {
  -webkit-appearance: none;
  appearance: none;
  width: 20px;
  height: 20px;
  border-radius: 50%;
  background: #0078d4;
  border: 2px solid white;
  cursor: pointer;
  transition: transform 0.2s ease-in-out;
}

.slider-container input[type="ranger"]::-webkit-slider-thumb:hover {
  transform: scale(1.2);
}

.slider-container .opacity-value {
  margin-top: 10px;
  font-size: 14px;
  color: #0078d4;
  font-weight: bold;
}

.sk-wave {
    margin: 0;
    position: absolute;
    top: 50%;
    left: 50%;
    margin-right: -50%;
    width: 4em;
    height: 4em;
    display: flex;
    justify-content: space-between;
  }
  
  .sk-wave-rect {
    background-color: var(--sk-color);
    height: 100%;
    width: 15%;
    animation: sk-wave 1.2s infinite ease-in-out; 
  }
  
  .sk-wave-rect:nth-child(1) { animation-delay: -1.2s; }
  .sk-wave-rect:nth-child(2) { animation-delay: -1.1s; }
  .sk-wave-rect:nth-child(3) { animation-delay: -1.0s; }
  .sk-wave-rect:nth-child(4) { animation-delay: -0.9s; }
  .sk-wave-rect:nth-child(5) { animation-delay: -0.8s; }
  
  @keyframes sk-wave {
    0%, 40%, 100% {
      transform: scaleY(0.4); 
    } 20% {
      transform: scaleY(1); 
    } 
  }