* {
    margin: 0;
    padding: 0;
    -webkit-box-sizing: border-box;
    -moz-box-sizing: border-box;
    box-sizing: border-box;
}
body {
    width: 100%;
    height: 100%;
    overflow: hidden;
    background-color: white;
}
#tangram {
    border: 3px solid green;
    overflow: hidden;
    margin: 0 auto;
}
fieldset.tangram {
    border: 0
}
label.tangram {
    display: block;
    margin: 30px 0 0 0;
}
p.tangram-instruction {
    margin-top: 5%;
    margin-bottom: 5%;
}