html,
body {
    margin: 0;
    padding: 0;
    overflow: hidden;
}

#playground {
    position: fixed;
    top: 0;
    left: 20%;
    width: 80%;
    height: 100%;
    display: flex;
    justify-content: center;
    background-color: antiquewhite;
}

#controls {
    position: fixed;
    top: 0;
    left: 0;
    width: 20%;
    height: 100%;
    overflow-y: auto;
    background-color: #222222;
    box-sizing: border-box;
    padding: 20px;
    color: white;
    font-family: Arial, sans-serif;
    font-size: 14px;
    line-height: 1.5;
}

button {
    width: 100%;
    border-radius: 10px;
    text-align: center;
    text-decoration: none;
    display: inline-block;
    font-size: 15px;
    margin: 4px 2px;
    transition-duration: 0.5s;
    cursor: pointer;
}

#controls div {
    display: flex;
    align-items: center;
    margin-bottom: 10px;
}

.red {
    color: red;
}

.blue {
    color: blue;
}

.green {
    color: green;
}

.yellow {
    color: yellow;
}

.white {
    color: white;
}

.particle {
    box-shadow: 0 0 5px 5px rgba(255, 255, 255, 0.5);
}

#control-pad {
    border-collapse: collapse;
    width: 100%;
}

#control-pad td {
    border: 1px solid black;
    width: 16.66%;
    height: 40px;
    text-align: center;
    position: relative;
}

#control-pad td input {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 100%;
    height: 100%;
    box-sizing: border-box;
    outline: none;
    background: transparent;
    color: whitesmoke;
    text-align: center;
    font-size: 10px;
}