*{
    margin:0;
    padding:0;
    box-sizing:border-box;
}

body{
    background:#dcdcdc;
    font-family:sans-serif;
}

.toolbar{
    background:#222;
    padding:10px;
    display:flex;
    gap:10px;
    align-items:center;
    flex-wrap:wrap;
}

button{
    padding:8px 12px;
    cursor:pointer;
}

canvas{
    display:block;
    margin:auto;
    background:white;
    cursor:crosshair;
}