.maincontent {
    max-width: 100%;
    margin: 0;
    padding: 50px 20px 100px;
    background: var(--pink);
}
.maincontent:after {
    content: "";
    position: absolute;
    bottom: -2px;
    width: 100%;
    height: 50px;
    background: #fff;
    left: 0;
    clip-path: polygon(0% 0%, 25% 0, 50% 100%, 75% 0, 100% 0%, 100% 100%, 0% 100%);
}