:root {
    --text-color: white;
    --black-0: rgb(17, 17, 17);
    --black-1: rgb(19, 19, 19);
    --black-2: rgb(31, 31, 31);
    --black-3: rgb(56, 56, 56);
}

* {
    margin: 0;
    padding: 0;
    outline: none;
    border: none;
    color: var(--text-color);
}

html, body {
    width: 100%;
    height: 100%;
    background: var(--black-0);
}

body {
    display: flex;
}

#options, textarea {
    resize: none;
    padding: 5px;
    box-sizing: border-box;
}

#io, #io textarea {
    flex: 2;
    background: var(--black-0);
}

#options {
    width: 650px;
    border-left: 1px solid var(--black-3);
}

@media screen and (max-width: 1100px) {
    #options {
        flex: 2;
    }
}

#io {
    display: flex;
    flex-direction: column;
}

#input {
    border-bottom: 1px solid var(--black-3);
}

input, button, select {
    border: 1px solid var(--black-3);
    border-radius: 0;

    height: 30px;

    background: var(--black-2);

    margin: 0px 0px 5px 0px;
    padding: 5px;
    box-sizing: border-box;
}

.category {
    background-color: var(--black-2);
    padding: 5px;
    margin-bottom: 10px;
    box-sizing: border-box;
}

h2 {
    font-size: 2rem;
    font-family: sans-serif;
    margin-bottom: 10px;
}

.run-button {
    width: 100%;
    height: 40px;
    background: rgb(13, 155, 13);
}

.run-button:hover {
    background-color: rgb(20, 187, 20);
}

.run-button:active {
    background-color: rgb(12, 139, 12);
}

button:hover {
    background-color: #272727;
}

button:active {
    background-color: #1a1a1a;
}

button {
    transition: background-color 150ms ease;
}

a {
    display: block;
    margin: 10px;
    color: dodgerblue;
    font-family: sans-serif;
}

a:visited {
    color: #808;
}