woocommerce/plugins/woocommerce-admin/packages/components/src/text-control/style.scss

.muriel-input-text {
	background: $studio-white;
	border: 1px solid $studio-gray-20;
	border-radius: 3px;
	height: 56px;
	box-shadow: none;
	padding: 12px 12px 4px;
	position: relative;
	box-shadow: $shadow-popover;

	&:hover {
		border-color: $studio-gray-40;
	}

	label {
		color: $studio-gray-50;
		font-size: 14px;
		line-height: 21px;

		&.components-base-control__label {
			margin: 0;
		}
	}

	.components-text-control__input {
		border: 0;
		box-shadow: none;
		font-size: 16px;
		line-height: 21px;
		margin: 0;
		padding: 0;
		min-height: 30px;

		&:focus {
			box-shadow: none;
		}
	}

	&.active {
		box-shadow: 0 0 0 2px $blue-medium-focus;
		border-color: transparent;

		input {
			color: $studio-gray-80;
		}
	}

	&.with-value {
		.components-base-control__label {
			display: block;
			position: relative;
			top: -8px;
			width: 100%;
			font-size: 12px;
		}

		input {
			color: $studio-gray-80;
			position: relative;
			top: -12px;
		}
	}

	&.empty {
		label {
			display: none;
		}
		input {
			color: $studio-gray-50;
		}
	}

	&.has-error {
		box-shadow: none;
	}

	&.disabled {
		label {
			display: none;
		}
		input {
			color: $studio-gray-20;

			/* Placeholder styling: */
			&::placeholder {
				/* Chrome, Firefox, Opera, Safari 10.1+ */
				color: $studio-gray-20;
				opacity: 1; /* Firefox */
			}
			&:-ms-input-placeholder {
				/* Internet Explorer 10-11 */
				color: $studio-gray-20;
			}
			&::-ms-input-placeholder {
				/* Microsoft Edge */
				color: $studio-gray-20;
			}
		}
	}
}