.contentIframeClass {
    width: 100%;
    height: 100%;
    position: absolute;
    inset: 0;
    border: none;
    background: #d9d9d9;
}

.dummyIFrameClass {
    display: none;
}

.prev,
.next {
    cursor: pointer;
    position: fixed;
    top: 50%;
    transform: translateY(-50%);
    padding: 14px 18px;
    color: #111;
    background: rgba(255,255,255,.78);
    border: 0;
    border-radius: 50%;
    font-weight: bold;
    font-size: 28px;
    line-height: 1;
    visibility: hidden;
    z-index: 20;
    box-shadow: 0 3px 12px rgba(0,0,0,.14);
}

.prev {
    left: 18px;
}

.next {
    right: 18px;
}

.prev:hover,
.next:hover,
.prev:focus-visible,
.next:focus-visible {
    background: #fff;
    outline: 3px solid #9b2d26;
    outline-offset: 3px;
}

html,
body {
    width: 100%;
    height: 100%;
    margin: 0;
    padding: 0;
    overflow: hidden;
    background: #d9d9d9;
}

@media (max-width: 767px) {
    .prev,
    .next {
        padding: 10px 13px;
        font-size: 22px;
    }

    .prev { left: 6px; }
    .next { right: 6px; }
}