oont-contents/plugins/woocommerce/assets/css/forms.scss

.woocommerce {
	/**
	 * Generic forms styles used in places such as my account and the shortcode based checkout.
	 */
	form .form-row {
		padding: 3px;
		margin: 0 0 6px;

		[placeholder]:focus::-webkit-input-placeholder {
			transition: opacity 0.5s 0.5s ease;
			opacity: 0;
		}

		label {
			line-height: 2;

			&.hidden {
				visibility: hidden;
		  	}

			&.inline {
				display: inline;
			}
		}

		.woocommerce-input-wrapper .description {
			background: #1e85be;
			color: #fff;
			border-radius: 3px;
			padding: 1em;
			margin: 0.5em 0 0;
			clear: both;
			display: none;
			position: relative;

			a {
				color: #fff;
				text-decoration: underline;
				border: 0;
				box-shadow: none;
			}

			&::before {
				left: 50%;
				top: 0%;
				margin-top: -4px;
				transform: translateX(-50%) rotate(180deg);
				content: "";
				position: absolute;
				border-width: 4px 6px 0 6px;
				border-style: solid;
				border-color: #1e85be transparent transparent transparent;
				z-index: 100;
				display: block;
			}
		}

		.input-checkbox {
			display: inline;
			margin: -2px 8px 0 0;
			text-align: center;
			vertical-align: middle;
		}

		.input-text,
		select {
			font-family: inherit;
			font-weight: normal;
			letter-spacing: normal;
			padding: .5em;
			display: block;
			background-color: var(--wc-form-color-background, #fff);
			border: var(--wc-form-border-width) solid var(--wc-form-border-color);
			border-radius: var(--wc-form-border-radius);
			color: var(--wc-form-color-text, #000);
			box-sizing: border-box;
			width: 100%;
			margin: 0;
			line-height: normal;
			height: auto;

			&:focus {
				border-color: currentColor;
			}
		}

		select {
			cursor: pointer;
			/* We hide the default chevron because it cannot be directly modified. Instead, we add a custom chevron using a background image. */
			appearance: none;
			padding-right: 3em;
			background-image: url(data:image/svg+xml;base64,PHN2ZyB4bWxucz0iaHR0cDovL3d3dy53My5vcmcvMjAwMC9zdmciIHZpZXdCb3g9IjAgMCAyNCAyNCIgZmlsbD0ibm9uZSIgc3Ryb2tlPSJibGFjayIgc3Ryb2tlLXdpZHRoPSIyIiBzdHJva2UtbGluZWNhcD0icm91bmQiIHN0cm9rZS1saW5lam9pbj0icm91bmQiIGNsYXNzPSJmZWF0aGVyIGZlYXRoZXItY2hldnJvbi1kb3duIj48cG9seWxpbmUgcG9pbnRzPSI2IDkgMTIgMTUgMTggOSI+PC9wb2x5bGluZT48L3N2Zz4=);
			background-repeat: no-repeat;
			background-size: 16px;
			background-position: calc(100% - 0.5em) 50%;
		}

		textarea {
			height: 4em;
			line-height: 1.5;
			box-shadow: none;
		}

		.required {
			color: var(--wc-red);
			font-weight: 700;
			border: 0 !important;
			text-decoration: none;
			visibility: hidden; // Only show optional by default.
		}

		.optional {
			visibility: visible;
		}

		&.woocommerce-invalid {
			label {
				color: var(--wc-red);
			}
			input.input-text,
			select {
				border-color: var(--wc-red);
			}
			.select2-container:not(.select2-container--open) .select2-selection {
				border-color: var(--wc-red);
			}
		}

		&.woocommerce-validated {
			input.input-text,
			select {
				border-color: var(--wc-green);
			}
			.select2-container:not(.select2-container--open) .select2-selection {
				border-color: var(--wc-green);
			}
		}

		::-webkit-input-placeholder {
			line-height: normal;
		}

		:-moz-placeholder {
			line-height: normal;
		}

		:-ms-input-placeholder {
			line-height: normal;
		}
	}
}

.select2-container {
	width: 100%;

	.select2-selection--single {
		height: auto;

		.select2-selection__rendered {
			padding: 0.5em;
			line-height: normal;
			box-sizing: border-box;
			color: var(--wc-form-color-text, #444);
			font-weight: normal;
		}

		.select2-selection__placeholder {
			color: #999;
		}

		.select2-selection__arrow {
			position: absolute;
			top: 2px;
			right: 0.5em;
			height: 100%;
			width: 16px;

			b {
				border: none;
				display: block;
				background:
					url(data:image/svg+xml;base64,PHN2ZyB4bWxucz0iaHR0cDovL3d3dy53My5vcmcvMjAwMC9zdmciIHZpZXdCb3g9IjAgMCAyNCAyNCIgZmlsbD0ibm9uZSIgc3Ryb2tlPSJibGFjayIgc3Ryb2tlLXdpZHRoPSIyIiBzdHJva2UtbGluZWNhcD0icm91bmQiIHN0cm9rZS1saW5lam9pbj0icm91bmQiIGNsYXNzPSJmZWF0aGVyIGZlYXRoZXItY2hldnJvbi1kb3duIj48cG9seWxpbmUgcG9pbnRzPSI2IDkgMTIgMTUgMTggOSI+PC9wb2x5bGluZT48L3N2Zz4=)
					no-repeat;
				background-size: 16px;
				width: 16px;
				height: 16px;
				position: absolute;
				top: 50%;
				left: 0;
				margin: -8px 0 0;
			}
		}
	}

	.select2-selection,
	.select2-dropdown {
		background-color: var(--wc-form-color-background, #fff);
		border: var(--wc-form-border-width, 1px) solid var(--wc-form-border-color, #aaa);
		border-radius: var(--wc-form-border-radius, 4px);
	}

	&.select2-container--open .select2-dropdown--above {
		border-bottom: none;
		border-bottom-left-radius: 0;
		border-bottom-right-radius: 0;
	}

	&.select2-container--open .select2-dropdown--below {
		border-top: none;
		border-top-left-radius: 0;
		border-top-right-radius: 0;
	}
}

.select2-results__options {
	list-style: none;
	margin: 0;
	padding: 0;
}

.select2-results__option {
	margin: 0;
}