uMatrix/src/css/raw-settings.css

div.body {
    box-sizing: border-box;
    display: flex;
    flex-direction: column;
    height: 100vh;
    justify-content: space-between;
    overflow: hidden;
    }
p {
    margin: 0.5em 0;
    }
textarea {
    box-sizing: border-box;
    flex-grow: 1;
    resize: none;
    text-align: left;
    white-space: pre;
    width: 100%;
    word-wrap: normal;
    }