:root {
    font-size: 16px;
}

* {
    box-sizing: border-box;
}

body {
    margin: 0;
    padding: 0;
    position: relative;
    overflow: hidden;
}

.clearfix::after {
    content: "";
    display: table;
    clear: both;
}

.controls {
    position: absolute;
    z-index: 1000;
    top: .5rem;
    right: .5rem;
    padding:0 10px;
    border:2px solid #808;
    box-shadow: 4px -4px 4px rgba(31, 3, 52, 0.4);
    border-radius: 8px;
    background-color: #fffa;
    font-family:Arial, Helvetica, sans-serif;
    font-size: 18px;
    color: #808;
}

H2 {
    font-weight: 700;
    font-size: 1.2em;
    margin: .5rem;
    flex-grow: 1;
    text-align: center;
}

label {
    display: block;
    margin-bottom: 10px;
}

input {
    float: left;
    margin-right: 1em;
    width: 4em;
    font-size: 18px;
    text-align: center;
}