checker.css

html {
    width: 100%;
    height: 100%;
}

body {
    font-family: Helvetica, Arial, sans-serif;
    width: 100%;
    height: 100%;
    font-size: 100%;
    line-height: 1.5em;
    padding: 0;
    margin: 0;
}

h1 {
    margin: 1em 0 .2em 0;
    padding: 0;
    line-height: 1.2em;
}

h2 {
    margin: 1.5em 0 .2em 0;
    padding: 0;
    font-size: 1em;
}

iframe + p {
    margin-top: 0;
    padding-top: .2em;
}

header form {
    display: block;
    background: #eee;
}

header form label {
    font-weight: bold;
}

header form p {
    padding: .5em 1em;
}

header form input {
    font-family: Helvetica, Arial, sans-serif;
    font-size: 1em;
}

header form input[type="url"] {
    width: 50%;
}

header,
footer {
    clear: left;
    float: left;
    width: 92%;
    position: relative;
    left: 4%;
}

#responsive,
#responsive div {
    clear: both;
    float: left;
    width: 100%;
}

#small {
    float: left;
    width: 30%;
    position: relative;
    left: 4%;
}

#medium {
    float: right;
    width: 58%;
    position: relative;
    right: 4%;
}

#large {
    clear: both;
    float: left;
    width: 92%;
    position: relative;
    left: 4%;
    padding-top: 1em;
}

#static {
    clear: both;
    float: left;
    width: 92%;
    position: relative;
    left: 4%;
    padding-bottom: 30px;
}