.button {
    width: 280px;
    display: block;
    margin: 20px auto;
}

.options {
    padding: 20px;
    background-color: rgba(191, 191, 191, 0.15);
    left: 0;
    position: absolute;
    bottom: 0;
    right: 0;
}

.caption {
    font-size: 18px;
    font-weight: 500;
}

.option {
    margin-top: 10px;
    text-align: right;
    line-height: 28px;
    display: inline-block;
    width: 100%;
}

.option > span {
    float: left;
}