style.css

html,
body {
    padding:0;
    margin: 0;
    width: 100%;
    box-sizing: border-box;
    font-family: "Reddit Mono", monospace;
    font-size: 14px;
    background-color: #2f2f2f;
    color: #E8E9F3;
    font-size: 16px;
}

.about a {
    color: #E8E9F3;
}

.root-container {
    margin: 60px auto;
    width: 85%;
}

.about {
    margin: 120px 0 24px;
}

.row {
    display: -ms-flexbox; /* IE10 */
    display: flex;
    -ms-flex-wrap: wrap; /* IE10 */
    flex-wrap: wrap;
    padding: 0 4px;
    justify-content: space-between;
    margin: 0 15px;
}

.column {
    -ms-flex: 100%; /* IE10 */
    flex: 100%;
    max-width: 100%;
    padding: 0 4px;
}

.column img {
    margin-top: 42px;
    vertical-align: middle;
    width: 100%;
    transition: filter 0.5s ease;
}

.column img:hover {
    filter: brightness(125%)
}

.box {
    box-shadow: 0 0 20px rgba(0, 0, 0, 0.5);
}

@media only screen and (min-width: 600px) {
    /* For tablets: */
}

@media only screen and (min-width: 768px) {
    /* For desktops: */
    .root-container {
        margin: 60px auto;
        width: 75%;
    }

    .column {
        -ms-flex: 30%; /* IE10 */
        flex: 30%;
        max-width: 30%;
        padding: 0 4px;
    }
}