header
{
    -webkit-box-shadow: 0 0 12px 0 rgba(0,0,0,.6);
    box-shadow: 0 0 12px 0 rgba(0,0,0,.6);
}
main
{
    padding: 0;
    height: calc(100vh - 76px);
}
main iframe
{
    display: block;
}
main .toggle-footer
{
    position: fixed;
    left: 0;
    right: 0;
    margin: 0 auto;
    width: 33px;
    bottom: 0;
    height: 20px;
    line-height: 24px;
    border-top-left-radius: 50px;
    border-top-right-radius: 50px;
    color: #fff;
    background-color: #252525;
    border: 1px solid #000;
    border-bottom: 0;
    text-align: center;
    font-size: 20px;
    font-weight: 700;
    z-index: 3;
    cursor: pointer;
    -webkit-transition: -webkit-filter .12s ease-in;
    transition: -webkit-filter .12s ease-in;
    transition: filter .12s ease-in;
    transition: filter .12s ease-in,-webkit-filter .12s ease-in;
}
main .toggle-footer:hover
{
    -webkit-filter: brightness(1.2);
    filter: brightness(1.2);
}
footer
{
    position: fixed;
    left: 0;
    bottom: 0;
    width: 100%;
    border-top: 2px solid var(--brandColor);
    z-index: 2;
    max-height: calc(100% - 200px);
    overflow: auto;
    display: none;
}