div.clear {
    clear: both;
}

div.videobox{
    float:left;
    margin-bottom: 15px;
}

/* OS用ボタンの設定 */
#install button.osbutton {
    margin-left: 10px;
    width: 180px;
    height: 40px;
    font-size: 20px;
    font-weight: bold;
    border-radius: 6px;
    text-decoration: none;
    padding: 0;
    color: #000;
    text-align: center;
    background-color: #FAFAFA;
}

#install button.osbutton:hover {
    opacity: 0.5;
    background-color: #33CCFF;
}
#install button.osbutton.active {
    background-color: #33CCFF;
    color: #444;
}

#install button.linkbutton {
    margin-left: 10px;
    width: 220px;
    font-size: 20px;
    font-weight: bold;
    border-radius: 6px;
    text-decoration: none;
    padding: 10px 0 4px 0;
    color: #000;
    text-align: center;
    background-color: #FAFAFA;
}
#install button.linkbutton:hover {
    opacity: 0.5;
}

#install button.linkbutton.active {
    background-color: #33CCFF;
}

#install select {
    font-size: 18px;
    background-color: #FFFFE3;
    margin-left: 10px;
}