body {
    background: #222;
}

.cell {
  padding: 10px;
}

.cell div {
    position: relative;
}

.cell div:first-child::before {
    border-radius: 50%;
    box-shadow: 5px 5px 10px rgba(0, 0, 0, 0.3);
    content: '';
    display: block;
    height: 99%;
    left: 0.5%;
    position: absolute;
    top: 0.5%;
    width: 99%;
}