body, html {
    margin: 0;
}

html {
    height: 100%;
}

body {
    height: 90%;
    max-width: 800px;
    margin: 0 auto;
}

h1, p {
    font-family: sans-serif;
    text-align: center;
    padding: 20px;
}

.txt, select, form > div {
    display: block;
    margin: 0 auto;
    font-family: sans-serif;
    font-size: 16px;
    padding: 5px;
}

.txt {
    width: 80%;
}

select {
    width: 83%;
}

form > div {
    width: 81%;
}

.txt, form > div {
    margin-bottom: 10px;
    overflow: auto;
}

.clearfix {
    clear: both;
}

label {
    float: left;
    width: 10%;
    line-height: 1.5;
}

.rate-value, .pitch-value {
    float: right;
    width: 5%;
    line-height: 1.5;
}

#rate, #pitch {
    float: right;
    width: 81%;
}

.controls {
    text-align: center;
    margin-top: 10px;
}

.controls button {
    padding: 10px;
}

textarea {
    box-sizing: border-box;
    width: 100%;
    height: 6rem;
    margin: auto;
}