index.css

body {
    margin: 0;
    padding: 0;
    font-family: sans-serif;
    /* background: #000; */

}


.container {
    width: 100%;
    height: 100vh;
    overflow: hidden;
}

.container .column {
    width: 20%;
    height: 100%;
    float: left;
    border-right: 2px solid rgba(0, 0, 0, .5);
    box-sizing: border-box;
    z-index: 1;
}

.container .column:lastchild {
    border-right: none;
}

.container .column .content {
    position: relative;
    height: 100%;

}



.container .column .content .box {
    position: absolute;
    top: 50%;
    transform: translateY(100%);
    box-sizing: border-box;
    padding: 80px;
    margin: 20px;
    background: wheat;
    text-align: center;
    transition: 0.4s;
    opacity: 0;

}

.container .column .content h1 {
    position: absolute;
    top: 50%;
    transform: translateY(-50%);
    width: 100%;
    background: rgba(0, 0, 0, .1);
    text-align: center;
    margin: 0;
    padding: 0;
    color: rgb(255, 255, 255, .2);
    font-size: 15em;
    border-top: 2px solid rgba(0, 0, 0, .5);
    border-bottom: 2px solid rgba(0, 0, 0, .5);
}

.container .column.active .content .box {
    opacity: 1;
    transform: translateY(-50%);
}


a:link {
    text-decoration: none;
}

a:visited {
    text-decoration: none;
}

a:hover {
    text-decoration: wheat;
    background-color: wheat;
}



.container .column .content .box h2 {
    margin: 0;
    padding: 0;
    font-size: 20px;
    text-align: justify;
    color: #262626;
}

.container .column .content .box p {
    color: #262626;
    font-size: 16px;
}


.container .column .bg {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    pointer-events: none;
    z-index: -1;

}

.container .column.active .bg.bg1 {
    background: url(bg1.jpeg);
    background-size: cover;
    background-attachment: fixed;
    background-position: center;
    transition: 0.5s;
}

.container .column.active .bg.bg2 {
    background: url(bg2.jpeg);
    background-size: cover;
    background-attachment: fixed;
    background-position: center;
    transition: 0.5s;
}

.container .column.active .bg.bg3 {
    background: url(bg3.jpeg);
    background-size: cover;
    background-attachment: fixed;
    background-position: center;
    transition: 0.5s;
}

.container .column.active .bg.bg4 {
    background: url(bg4.jpeg);
    background-size: cover;
    background-attachment: fixed;
    background-position: center;
    transition: 0.5s;
}

.container .column.active .bg.bg5 {
    background: url(bg5.jpeg);
    background-size: cover;
    background-attachment: fixed;
    background-position: center;
    transition: 0.5s;
}

.box .front {
    left: 0;
    width: 100%;
    height: 100%;
    backface-visibility: hidden;
    transform: rotateX(0deg);
    transition: 0.5s;

}

.box:hover .front {
    transform: rotateX(-180deg);
}

.box .front h2 {
    display: inline-block;
    width: 15px;
    height: 15px;
    text-align: center;
    color: #262626;
    text-decoration: none;
    border-radius: 50%;
    transition: 0.5s;
}

.box .back {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    backface-visibility: hidden;
    transform: rotateX(180deg);
    transition: 0.5s;


}

.box .back:before {
    content: '';
    position: absolute;
    top: 0;
    left: -50%;
    width: 100%;
    height: 100%;
}

.box:hover .back {
    transform: rotateX(0deg);
}


.social-icons {
    padding: 80px 0;
}

.social-icons a {
    display: inline-block;
    width: 15px;
    height: 15px;
    text-align: center;
    color: #262626;
    text-decoration: none;
    border-radius: 50%;
    transition: 0.5s;
}

.social-icons a .fa {
    line-height: 36px;
}

.social-icons a:hover .fa {
    background: peachpuff;
}

@media screen and (max-width: 780px) {
    .container .column {
        border-right: none;
    }

    .container .column .content {
        width: 100%;
        height: 100vh;
    }

    .container .column .content h1 {
        font-size: 5em;
    }

    .container .column .content .box {
        padding: 2px;
        margin: 2px;
        position: sticky;
    }

    .container .column .content .box h2{
    text-align: center;
    }
}

@media screen and (max-width: 480px) {
    .container .column {
        border-right: none;
    }

    .container .column .content {
        width: 100%;
        height: 100vh;
    }

    .container .column .content h1 {
        font-size: 2em;
    }

    .container .column .content .box {
        padding: 2px;
        margin: 2px;
    }
}