body, html {
    margin: 0;
    padding: 0;
    height: 100%;
}

header, footer {
    height: 20px;
    background-color: lightgray;
}

main {
    height: 80%;
}

.blocks-container {
    display: flex;
}

.block {
    flex-grow: 1;
    border: 1px solid black;
    overflow: auto;
    padding: 10px;
}

pre {
    margin: 0;
}

code {
    white-space: pre-wrap;
}