header {
    text-align: center;
    background-color: #f0f0f0;
    padding: 1em;
    font-size: 1.5em;
    font-weight: bold;
}

body {
    display: flex;
    flex-direction: column;
    font-family: "Ubuntu", sans-serif;
}

.b_column {
    float: left;
    flex: 70%;
    padding: 10px;
}

.s_column {
    float: left;
    flex: 30%;
    padding: 10px;
}

.row {
    display: flex;
}

img {
    width: 200px;
    height: 200px;
}