* {
    padding: 0;
    margin: 0;

    box-sizing: border-box;
}

body {
    width: 100vw;
    height: 100vh;
    overflow: hidden;
}

button {
    padding: 0.25rem 0.3rem;
}

.toolbar {
    background-color: #fff;

    padding: 0.25rem 0.5rem;
    border-radius: 0.25rem;
    box-shadow: 2px 2px 4px #0003, 0px 0px 4px #0003;

    display: flex;
    flex-direction: row;
    align-items: center;

    position: fixed;
    bottom: 0.4rem;
    left: 50%;
    transform: translateX(-50%);
}

@media print {
    .toolbar {
        display: none;
    }
}

.toolbar__brush-size {
    display: flex;
    flex-direction: row;
    align-items: center;
}

.toolbar__brush-preview {
    --color: #000;
    background-color: var(--color);

    --size: 1px;
    width: var(--size);
    height: var(--size);
    border-radius: 50%;
    margin: 0 0.25rem;
}