body {
    background-color: #FFFDD7;
    color:  #ff0000;
}

canvas {
    position: fixed;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
}

div.action {
    position: fixed;
    top: 20px;
    right: 20px;

    display: flex;
    align-items: center;
}

input {
   width: 100px; 
   margin-left: 5px;
}