style.css

html,
body {
    max-height: 100%;
    overflow-y: hidden;
}

body {
    background-color: #1F1E33;
    font-family: "Lucida Sans Typewriter", "Fira Code", monospace;
}

#form {
    width: 80%;
    margin-left: auto;
    margin-right: auto;
    color: #EFF;
}

#caption {
    font-style: normal;
    text-align: center;
}

input,
button {
    font-family: "Lucida Sans Typewriter", "Fira Code", monospace;
}

button {
    border: none;
    background-color: #FEF;
    padding: 10px;
}

button:hover {
    background-color: #28B5D4;
}

table {
    width: 100%;
    height: 100%;
    position: relative;
    font-size: 16px;
    text-align: center;
    background: #1F1E33;
    color: #EFF;
    border-collapse: collapse;
    margin-left: auto;
    margin-right: auto;
    table-layout: fixed;
}

.space {
    width: 30px;
}

.rail {
    width: 8px;
    height: 80%;
    border-right: 1px solid #FFF;
    border-left: 1px solid #FFF;
}

.key {
    border-top: 1px solid #FFF;
    border-bottom: 1px solid #FFF;
    border-right: 1px solid #FFF;
    border-left: 1px solid #FFF;
}

.miss {
    height: auto;
    text-align: center;
    z-index: 1;
}

@keyframes broken {
  from {opacity: 1;}
  to {opacity: 0;}
}

div.test {
    position: absolute;
    border: 1px solid #777;
    box-sizing: border-box;
    background: #EA8;
}

div.note {
    position: absolute;
    background: #FFF;
}

div.hold {
    transition: background 0.06s;
    position: absolute;
    background: #99D9EA;
}

div.held {
    position: absolute;
    background: #28A5C4;
}

div.great {
    position: absolute;
    background: #fccf55;
}

div.broken {
    animation: broken 0.2s;
    animation-fill-mode: forwards;
    position: absolute;
    background: #A24;
}

div.missed {
    position: absolute;
    background-color: #777;
}

.scoremargin {
  height: 35%;
}

.score {
  position: absolute;
  top: 10;
  left: 10;
  color: #EEF;
  font-size: 36px;
}

.stats {
  position: absolute;
  margin: auto;
  left: 0;
  right: 0;
  top: 10%;
  z-index: 1;
  color: #218;
  text-align: center;
  text-shadow: #FFF 1px 0 0, #FFF 0 1px 0, #FFF -1px 0 0, #FFF 0 -1px 0;
  font-weight: bold;
}

small {
  color: #FFF;
  text-shadow: #000 1px 0 0, #000 0 1px 0, #000 -1px 0 0, #000 0 -1px 0;
}