.rectangle-inward-corners {
    width: 150px;  /* Adjust width */
    height: 100px; /* Adjust height */
    background-color: #3498db; /* Adjust the color */
    clip-path: polygon(0% 0%, 100% 0%, 100% 20%, 80% 0%, 100% 100%, 20% 100%, 0% 80%, 0% 20%)
}