body { 
    background-color: #333;
    margin: 0px;
    padding: 0px;

    max-width: 100vw;
    height: 100vh;
    max-height: 100vh;

    font-family: consolas;
    font-size: 18px;

    display: flex;
    flex-direction: column;
}
header {
    background-color: #333;
    color: white;
    display: flex;
    flex-direction: row;
    justify-content: space-between;
    padding: 5px;
}
section {
    flex-grow: 1;

    display: flex;
    flex-direction: row;
}

section > main, section > textarea  {
    flex-grow: 1;
}

section > aside {
    background-color: #333;
    color: white;
    padding: 1em;
    font-size: 0.75em;
}

textarea {
    resize: none;
    flex-grow: 1;
    border: none;

    padding: 1em;
    font-size: 20px;
    border-right: 0.5em #333 solid;
}
main {
    max-width: 500px;
    height: calc(100vh - 4em);
    overflow-y: scroll;
}