Stamp border

HTML

<div class="stamp-border">
    <div class="stamp-border__content"></div>
</div>

CSS

.stamp-border {
    /* Background */
    background-color: #d1d5db;
    background-image: radial-gradient(#fff 50%, transparent 50%);
    background-position: -0.25rem -0.25rem;
    background-repeat: repeat;
    background-size: 0.5rem 0.5rem;

    /* Spacing */
    padding: 0.25rem;
}

.stamp-border__content {
    /* Background */
    background-color: #d1d5db;

    height: 100%;
    width: 100%;
}