* {
    margin: 0;
    padding: 0;
}

/* page structure */
body {
    font-family: "Helvetica Neue", Helvetica, sans-serif;
    background-color: #abe;
}

#content {
    width: 1200px;
    margin-left: auto;
    margin-right: auto;
    margin-top: .5em;
    border: thin solid #333;
    background-color: white;
    border-top-left-radius: .75em;
    border-top-right-radius: .75em;
}

header {
    background: -moz-linear-gradient(top, #ffa, #9d9);
    padding: 1em 3em 1em;
    color: #333; 
    border-bottom: thin solid #d6d6d6; 
    border-top-left-radius: .75em;
    border-top-right-radius: .75em;
}

article {
    padding: 1em 3em 1em;
    font-size: 85%;
}

.group{
    float: left;
    padding: 1em;
    margin: 1em;
    border: thin solid;
    border-radius: .75em;
    width: 220px;
    height: 100px;
}

#groupA {
    background-color: blue;    
}

#groupB {
    background-color: pink;
}

#groupC {
    background-color: yellow;
}

#groupD {
    background-color: green;
}

#listGroups {
    margin-left: auto;
    margin-right: auto;
    display: table-cell;
}

.ranking{
    float: left;
    padding: 1em;
    margin: 2.5em;
    border: thin solid;
    width: 180px;
    height: 100px;
}

.quarter{
    float: left;
    padding: 1em;
    margin: 1em;
    margin-top: 5em;
    border: thin solid;
    border-radius: .75em;
    width: 220px;
    height: 80px;

}

.semi{
    float: left;
    padding: 1em;
    margin: 1em;
    border: thin solid;
    border-radius: .75em;
    width: 220px;
    height: 80px;
}

#S1{
    margin-left: 15em;
}

#S2{
    margin-left: 14em;
}

#F{
    padding: 1em;
    margin: 1em;
    margin-left: auto;
    margin-right: auto;
    border: thin solid;
    border-radius: .75em;
    width: 220px;
    height: 80px;
}