* {
    box-sizing: border-box;
}

html,
body {
    padding: 0;
    margin: 0;
    font-family: 'Helvetica Neue', Helvetica, Arial, sans-serif;
    color: #000;
}

.a {
    width: 100vw;
    height: 100vh;
}

.b {
    width: 50%;
    height: 100%;
    float: left;
    display: flex;
    align-items: center;
    justify-content: center;
}

.c1 {
    width: 50%;
    height: 100%;
    float: left;
    background: url("opt1.jpg") no-repeat center;
    background-size: cover;
}
.c2 {
    width: 50%;
    height: 100%;
    float: left;
    background: url("opt2.jpg") no-repeat center;
    background-size: cover;
}

.d {
    text-align: center;
    max-height: 100vh;
    overflow-y: scroll;
    width: 100%;
    padding: 50px 30px;
}

.d img {
    width: 100%;
    max-width: 250px;
    margin-bottom: 20px;
}

.d > p {
    max-width: 500px;
    margin: 15px auto;
}
.d a { word-break: break-all;}

.e1 {
    width: 50%;
    height: 100%;
    float: left;
    background: url("opt1.jpg") no-repeat center;
    background-size: cover;
}
.e2 {
    width: 50%;
    height: 100%;
    float: left;
    background: url("opt2.jpg") no-repeat center;
    background-size: cover;
}


@media screen and (max-width:600px) {
    .b {
        width: 100%;
    }

    .c,.e {
        display: none;
    }
}