.site-banner {
    position: relative;
    z-index: 999;
    background: #fff;
    padding: 20px;
    overflow: hidden;
    background: rgba(0,0,0,.05);
}

.site-banner__container {
    display: flex;
    align-items: flex-start;
}

.site-banner p {
    font-size: .8em;
    flex: 0 1 auto;
    padding-right: 20px;
    margin: 0;
}

.site-banner__button {
    background: #2db340;
    color: #fff;
    border: 0;
    flex: 1 0 auto;
    text-transform: uppercase;
    padding: 10px 25px;
    border-radius: 3px;
    font-family: Source Sans Pro,serif;
    letter-spacing: 3px;
    font-size: 12px;
    font-weight: 700;

}

.site-banner__close {
    width: 16px;
    height: 16px;
    transform: rotate(45deg);
    position: relative;
    flex: 0 0 16px;
    margin: 10px 0 0 10px;
}

.site-banner__close:before {
    height: 16px;
    content: '';
    width: 2px;
    background: #000;
    display: block;
    left: 50%;
    transform: translateX(-50%);
    position: absolute;
}

.site-banner__close:after {
    width: 16px;
    content: '';
    height: 2px;
    background: #000;
    display: block;
    top: 50%;
    transform: translateY(-50%);
    position: absolute;
}