body {
    font-family: sans-serif;
    background: #f4f4f4;
    margin: 0;
    padding: 20px;
  }
  .back-button {
  position: absolute;
  top: 1rem;
  left: 1rem;
  padding: 0.5rem 1rem;
  font-size: 1rem;
  background-color: #000000;
  border: none;
  border-radius: 5px;
  cursor: pointer;
  color: white;
}

.back-button:hover {
  background-color: #aaa;
}

  
  /* This wrapper keeps everything nicely aligned */
  .wrapper {
    width: 640px;
    margin: 0 auto;
    text-align: center;
  }
  
  h1 {
    margin-bottom: 20px;
  }
  .sprite-selector {
    display: flex;
    align-items: center;
    gap: 10px;
    margin-bottom: 20px;
  }
  canvas {
    display: block;
    margin: 0 auto 20px auto; /* top, right/left, bottom */
  }
  .canvas-wrapper {
    display: flex;
    justify-content: center;
    align-items: center;
    height: 100vh; /* full screen height */
  }
  .canvas-container {
    margin: 20px auto;
    display: flex;
    justify-content: center;
  }
  #time-display {
    font-size: 1.2em;
    font-weight: bold;
    text-align: center;
    margin-bottom: 10px;
  }
  #controls {
    display: flex;
    flex-direction: column;
    align-items: center;
    margin-bottom: 20px;
    font-family: sans-serif;
    font-size: 1em;
  }
  
  #controls label {
    font-weight: bold;
    margin-bottom: 5px;
  }
  
  #controls input[type="range"] {
    width: 300px;
  }
  
  #reset-params {
    margin-top: 12px;
    padding: 8px 16px;
    font-size: 1em;
    border: none;
    border-radius: 6px;
    background-color: #6366F1;
    color: white;
    cursor: pointer;
    transition: background-color 0.3s ease;
  }
  
  #reset-params:hover {
    background-color: #4F46E5;
  }
  #reset-trajectory {
    margin-top: 12px;
    padding: 8px 16px;
    font-size: 1em;
    border: none;
    border-radius: 6px;
    background-color: #10b981;
    color: white;
    cursor: pointer;
    transition: background-color 0.3s ease;
  }
  
  #reset-trajectory:hover {
    background-color: #059669;
  }
  #preset-container {
    margin-top: 10px;
    margin-bottom: 10px;
    text-align: center;
  }
  
  #preset-select {
    padding: 6px 12px;
    font-size: 1em;
    border-radius: 6px;
    margin-left : 70px;
  }

  #double-launch{
    margin-top: 12px;
    padding: 8px 16px;
    font-size: 1em;
    border: none;
    border-radius: 6px;
    background-color: #ec1505;
    color: white;
    cursor: pointer;
    transition: background-color 0.3s ease;
  }
  
  #double-launch:hover {
    background-color: #ec1505;
  }