body{
    margin:0;
    background:#000;
    display:flex;
    flex-direction:column;
    align-items:center;
    font-family:Arial;
    color:white;
    height:100vh;
    overflow:hidden; /* scroll tiltása */
}

.toolbar{
    margin:8px 0;
    display:flex;
    gap:10px;
    flex-wrap:wrap;
    justify-content:center;
    max-width:820px;
}

.canvas-wrapper{
    position:relative;
    flex:1; /* a maradék helyet foglalja el */
    width:100%;
    max-width:820px;
}

canvas{
    position:absolute;
    left:0;
    top:0;
    width:100%;  /* canvas mindig kitölti a wrapper-t */
    height:100%;
    touch-action:none;
}


.color-btn{
    width:28px;
    height:28px;
    border-radius:50%;
    border:2px solid white;
    cursor:pointer;
}

.size-btn{
    padding:6px 12px;
    border:none;
    background:#444;
    color:white;
    cursor:pointer;
    border-radius:6px;
}

.size-btn.active{
    background:#00aaff;
}