<div class="grad"></div>
<div class="grad"></div>
<div class="grad"></div>

* {
	box-sizing: border-box;
}

body {
	margin: 0;
	padding: 3rem;
	display: flex;
	flex-wrap: wrap;
	justify-content: center;
	align-items: center;
	min-height: 100vh;
}

.grad {
	width: 15rem;
	height: 15rem;
	margin: 1rem;
	background: linear-gradient(45deg, deeppink 50%, transparent 50%);
	filter: drop-shadow(0.6rem 0.6rem 1rem rgba(20, 20, 180, 0.8));
}

.grad:nth-child(2) {
	background: radial-gradient(circle at center, deeppink 50%, transparent 50%);
}

.grad:nth-child(3) {
	background: linear-gradient(45deg, transparent 60%, deeppink 60%), linear-gradient(135deg, transparent 60%, deeppink 60%);
}