Внутренняя граница

<svg width="800px" height="800px" viewBox="0 0 512 512" xmlns="http://www.w3.org/2000/svg"> <polygon fill="var(--ci-primary-color, #000000)" points="240 272 240 440 240 472 272 472 272 440 272 272 440 272 472 272 472 240 440 240 272 240 272 72 272 40 240 40 240 72 240 240 72 240 40 240 40 272 72 272 240 272" class="ci-primary"/> <rect width="32" height="32" x="440" y="440" fill="var(--ci-primary-color, #000000)" class="ci-primary"/> <rect width="33.455" height="32" x="306.182" y="440" fill="var(--ci-primary-color, #000000)" class="ci-primary"/> <rect width="33.455" height="32" x="172.364" y="440" fill="var(--ci-primary-color, #000000)" class="ci-primary"/> <rect width="33.455" height="32" x="373.091" y="440" fill="var(--ci-primary-color, #000000)" class="ci-primary"/> <rect width="33.455" height="32" x="105.455" y="440" fill="var(--ci-primary-color, #000000)" class="ci-primary"/> <rect width="32" height="32" x="40" y="440" fill="var(--ci-primary-color, #000000)" class="ci-primary"/> <rect width="32" height="33.454" x="40" y="306.183" fill="var(--ci-primary-color, #000000)" class="ci-primary"/> <rect width="32" height="33.454" x="40" y="373.092" fill="var(--ci-primary-color, #000000)" class="ci-primary"/> <rect width="32" height="33.454" x="40" y="172.364" fill="var(--ci-primary-color, #000000)" class="ci-primary"/> <rect width="32" height="33.454" x="40" y="105.455" fill="var(--ci-primary-color, #000000)" class="ci-primary"/> <rect width="32" height="32" x="40" y="40" fill="var(--ci-primary-color, #000000)" class="ci-primary"/> <rect width="33.455" height="32" x="306.182" y="40" fill="var(--ci-primary-color, #000000)" class="ci-primary"/> <rect width="33.455" height="32" x="172.364" y="40" fill="var(--ci-primary-color, #000000)" class="ci-primary"/> <rect width="33.455" height="32" x="373.091" y="40" fill="var(--ci-primary-color, #000000)" class="ci-primary"/> <rect width="33.455" height="32" x="105.455" y="40" fill="var(--ci-primary-color, #000000)" class="ci-primary"/> <rect width="32" height="32" x="440" y="40" fill="var(--ci-primary-color, #000000)" class="ci-primary"/> <rect width="32" height="33.454" x="440" y="373.091" fill="var(--ci-primary-color, #000000)" class="ci-primary"/> <rect width="32" height="33.454" x="440" y="306.182" fill="var(--ci-primary-color, #000000)" class="ci-primary"/> <rect width="32" height="33.454" x="440" y="105.454" fill="var(--ci-primary-color, #000000)" class="ci-primary"/> <rect width="32" height="33.454" x="440" y="172.363" fill="var(--ci-primary-color, #000000)" class="ci-primary"/> </svg>