chomp.css

.mouth {
	position: relative;
}

.mouth::after {
	content: '';
    background:#eb6667;
    height: 5px;
    border-radius: 20px;
    bottom: 20px;
    left: 30%;
    width: 40%;
    z-index: 1;
    position: absolute;
}

.mouth input {
	text-align: center;
	border: 12px solid red;
	border-radius: 6px 6px 40px 40px;
	z-index: 1;
	position: relative;
	height: auto;
	min-height: 28px;
	background: #761f20;
	color: transparent;
	transition: height ease-in-out .2s;
}

.mouth input[type="text"]:focus {
	height: 60px;
	color: #fff;
	outline: none;
}

.mouth.closed input {
	height: 20px;
	min-height: auto;
}

.teeth {
	display: flex;
	position: absolute;
    left: 16px;
    right: 16px;
    z-index: 2;   
}

.teeth.top-teeth {
	align-items: flex-start;
	top: 12px;
}

.teeth.bottom-teeth {
	align-items: flex-end;
	bottom: 12px;
	left: 40px;
	right: 40px;
	flex: none;
}

.tooth {
	flex: 1;
	height: 8px;
	background: #fff;
	border: 1px solid #761f20;
}