.gutter {
    background-color: #27272a;
    cursor: col-resize;
    position: relative;
}

.gutter:hover {
    background-color: #3b82f6;
}

.gutter::after {
    content: "";
    position: absolute;
    top: 50%;
    left: 50%;
    width: 3px;
    height: 40px;
    background: #71717a;
    border-radius: 10px;
    transform: translate(-50%, -50%);
}