derw-lang/css/main.css

:root {
    font-family: sans-serif;
}

.block {
    padding: 2px;
    margin: 2px;
    display: flex;
    flex-wrap: wrap;
    max-width: 250px;
    align-items: center;
    border: solid rgba(32,32,32,0.5) 2px;
    background: rgb(200,200,200);
}

.op-40 {
    margin-top: 0;
    margin-bottom: 0;
}

.op-91 {
    border-radius: 10px;
}

.op-123 {
    display: block;
    background: rgb(225,225,225);
}

.op-nil {
    font-family: monospace;
    background: rgb(255,255,255);
    max-width: none;
}

.block-push {
    background: rgb(135, 250, 154);
}

.block-pop {
    background: rgb(250, 135, 135);
}