:root {
    --error-color: #ff0000;
}

* {
    box-sizing: border-box;
    font-family: monospace;
}

html {
    display: flex;
    flex-direction: column;
    align-items: center;
}

body {
    max-width: 900px;
    padding: 16px;
    width: 100%;
}

textarea {
    padding: 8px;
    outline: none;
}

.flex {
    display: flex;
}

.flex.column {
    flex-direction: column;
}

.flex.justify-content-center {
    justify-content: center;
}

.flex > * {
    margin-bottom: 8px;
}

.error {
    border: solid 1px var(--error-color);
}

.button {
    user-select: none;
    padding: 4px 16px;
    width: fit-content;
    text-decoration: none;
    color: black;
    background-color: #90caf9;
    box-shadow: 0px 3px 1px -2px rgba(0, 0, 0, 0.2), 0px 2px 2px 0px rgba(0, 0, 0, 0.14),
        0px 1px 5px 0px rgba(0, 0, 0, 0.12);
}

.button:hover {
    background-color: rgb(100, 141, 174);
    box-shadow: 0px 3px 3px -2px rgba(0, 0, 0, 0.4), 0px 3px 4px 0px rgba(0, 0, 0, 0.28),
        0px 1px 8px 0px rgba(0, 0, 0, 0.24);
}

.button:active {
    box-shadow: 0px 3px 1px -2px rgba(0, 0, 0, 0.2), 0px 2px 2px 0px rgba(0, 0, 0, 0.14),
        0px 1px 5px 0px rgba(0, 0, 0, 0.12);
}