.carousel-item {
    height: 100vh;
    background: #212121;
}

.carousel-control-next,
.carousel-control-prev {
    width: 8% !important;
}

.carousel-item.active,
.carousel-item-left,
.carousel-item-right {
    display: flex !important;
    justify-content: center;
    align-items: center;
}

.carousel-item h1 {
    color: #fff;
    font-size: 72px;
    padding: 0 10%;
}

.demo a {
    position: absolute;
    bottom: 20px;
    left: 50%;
    z-index: 2;
    display: inline-block;
    transform: translate(-50%, -50%);
    color: #fff;
    font: normal 400 20px/1 'Josefin Sans', sans-serif;
    letter-spacing: .1em;
    text-decoration: none;
    transition: opacity .3s;
}

.demo a:hover {
    opacity: .5;
}

#section02 a span,
#section03 a span {
    position: absolute;
    top: 0;
    left: 50%;
    width: 46px;
    height: 46px;
    margin-left: -23px;
    border: 1px solid #fff;
    border-radius: 100%;
    box-sizing: border-box;
}

#section02 a span::after,
#section03 a span::after {
    position: absolute;
    top: 50%;
    left: 50%;
    content: '';
    width: 16px;
    height: 16px;
    margin: -12px 0 0 -8px;
    border-left: 1px solid #fff;
    border-bottom: 1px solid #fff;
    transform: rotate(-45deg);
    box-sizing: border-box;
}

#section03 a {
    padding-top: 60px;
}

#section03 a span::before {
    position: absolute;
    top: 0;
    left: 0;
    z-index: -1;
    content: '';
    width: 44px;
    height: 44px;
    box-shadow: 0 0 0 0 rgba(255, 255, 255, .1);
    border-radius: 100%;
    opacity: 0;
    animation: sdb03 3s infinite;
    box-sizing: border-box;
}

@keyframes sdb03 {
    0% {
        opacity: 0;
    }
    30% {
        opacity: 1;
    }
    60% {
        box-shadow: 0 0 0 60px rgba(255, 255, 255, .1);
        opacity: 0;
    }
    100% {
        opacity: 0;
    }
}