JSFiddle - React, Tailwind, and code Playground

by Dhaval Vachhani

HTML

<div style="width:auto">
	<div class="rhombus">
		<input name="name" placeholder="Ваше имя"/>
	</div>
</div>

CSS

div {
	display: flex;
	flex-wrap: wrap;
	margin: 0;
	padding: 30px 20px;
	border: none;
	font-family: sans-serif;
}

div .header {
	flex-basis: 100%;
	margin: -10px 0 10px;
	text-align: center;
	color: #1E9BAF;
}

div input,
div button {
	flex-grow: 1;
	height: 30px;
	margin: 0 5px;
	padding: 0 5px;
	box-sizing: border-box;
	background-color: #1E9BAF;
	border: 0;
}

.rhombus {
	position: relative;
	-webkit-perspective: 600px;
	perspective: 600px;
	border-radius: 10px;
}

.rhombus:before,
.rhombus:after {
	content: "";
	position: absolute;
	left: 0;
	height: 50%;
	width: 100%;
	background-color: #1E9BAF;
	z-index: -1;
}

.rhombus:before {
	top: 0;
	-webkit-transform: rotateX(30deg);
	-webkit-transform-origin: center bottom;
	-ms-transform: rotateX(30deg);
	-ms-transform-origin: center bottom;
	transform: rotateX(30deg);
	transform-origin: center bottom;
	border-radius: 10px 10px 0 0;
}

.rhombus:after {
	bottom: 0;
	-webkit-transform: rotateX(-30deg);
	-webkit-transform-origin: center top;
	-ms-transform: rotateX(-30deg);
	-ms-transform-origin: center top;
	transform: rotateX(-30deg);
	transform-origin: center top;
	border-radius: 0 0 10px 10px;
}