Stamp border

<div class="container">
    <!-- Inner -->
    <div class="container__inner">
        <!-- Content -->
        ...
    </div>
</div>

.container {
                        /* Background */
                        background-color: #ccc;
                        background-image: radial-gradient(#fff 50%, transparent 50%);
                        background-position: -5px -5px;
                        background-repeat: repeat;
                        background-size: 10px 10px;

                        /* Spacing */
                        padding: 5px;
                    }

                    .container__inner {
                        /* Background */
                        background-color: #ccc;
                    }