odin-etch-a-sketch/style.css

body{
    background-color: #333;
    color: #eee
}
.area{
    display: flex;
    justify-content: center;
    align-items: center;
    height: 90vh;
}
.container{
    border: 1px solid #eee;
    height: 500px;
    width: 500px;
    display: flex;
    flex-wrap: wrap;
}

.grid {
    border: 1px solid #eee;
}