html,
body {
    height: 100%;
    margin: 0;
}

.carousel,
.carousel-inner,
.carousel-item {
    height: 100vh;
    /* full viewport height */
}

.carousel-item img {
    height: 100%;
    width: 100%;
    /* object-fit: cover; */
    /* maintains aspect ratio, fills area */
}

.carousel-caption-custom {
    position: absolute;
    bottom: 20px;
    left: 20px;
    color: #fff;
    font-size: 14px;
    z-index: 10;
    background: rgba(0, 0, 0, 0.4);
    /* optional readability */
    padding: 5px 10px;
    border-radius: 4px;
}

.whatsapp-float {
    position: absolute;
    bottom: 20px;
    right: 20px;
    z-index: 10;
    background-color: #25D366;
    color: #fff;
    width: 50px;
    height: 50px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 24px;
    text-decoration: none;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.3);
}

.whatsapp-float:hover {
    background-color: #1ebe5d;
    color: #fff;
}