body {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    margin: 0;
    height: 100vh;
    background-color: rgb(226, 226, 226);
    position: relative;
    font-family: Arial, sans-serif;
    text-align: center;
}

#intro-screen {
    text-align: center;
    position: absolute;
    top: 20%;
    left: 50%;
    transform: translateX(-50%);
    width: 80%;
    max-width: 800px;
    background: white;
    padding: 20px;
    border: 2px solid black;
    border-radius: 10px;
    box-shadow: 0 0 10px rgba(0,0,0,0.2);
}

#speed-controls {
  margin-top: 20px;
  font-size: 16px;
}

#speed-controls input {
  width: 60px;
  margin: 0 10px;
}

#start-button {
  margin-top: 30px;
  padding: 10px 20px;
  font-size: 16px;
}

#gameCanvas {
    width: 90vw;
    max-width: 1280px;
    height: auto;
    aspect-ratio: 16/9;
}

#response-buttons {
    position: absolute;
    top: 70%;
    left: 50%;
    transform: translateX(-50%);
    text-align: center;
    width: 90%;
    max-width: 1280px;
    padding: 20px 0;
}

#message-box {
    position: absolute;
    top: 30%;
    left: 50%;
    transform: translateX(-50%);
    background: white;
    border: 2px solid black;
    border-radius: 10px;
    padding: 20px;
    font-size: 1.5vw;
    max-width: 80%;
    text-align: center;
    box-shadow: 0 0 10px rgba(0,0,0,0.2);
    z-index: 10;
}

.hidden {
    display: none;
}

button {
    margin: 5px;
    padding: 4px 8px;
    font-size: 2vw;
    width: 100%;
    max-width: 100px;
}