.mainbox {
    max-width: 100%;
    margin: auto;
    font-family: Verdana, Sans-Serif;
    font-size: 14px;
    padding: 20px;
}

.btn {
    -moz-user-select: none;
    background-image: none;
    background-color: #DDDDDD;
    border: 1px solid #ccc;
    border-radius: 4px;
    cursor: pointer;
    text-align: center;
    vertical-align: middle;
    white-space: nowrap;
    height: 34px;
    width: 150px;
    margin-top: 20px;
}