woocommerce/packages/woocommerce-blocks/assets/js/blocks/cart-checkout/payment-methods/style.scss

.wc-block-card-elements {
	display: flex;
	width: 100%;

	.wc-block-components-validation-error {
		position: static;
	}
}

.wc-block-gateway-container {
	position: relative;
	margin-bottom: em($gap-large);
	white-space: nowrap;

	&.wc-card-number-element {
		flex-basis: 15em;
		flex-grow: 1;
		// Currently, min() CSS function calls need to be wrapped with unquote.
		min-width: unquote("min(15em, 60%)");
	}

	&.wc-card-expiry-element {
		flex-basis: 7em;
		margin-left: $gap-small;
		min-width: unquote("min(7em, calc(24% - #{$gap-small}))");
	}

	&.wc-card-cvc-element {
		flex-basis: 7em;
		margin-left: $gap-small;
		// Notice the min width ems value is smaller than flex-basis. That's because
		// by default we want it to have the same width as `expiry-element`, but
		// if available space is scarce, `cvc-element` should get smaller faster.
		min-width: unquote("min(5em, calc(16% - #{$gap-small}))");
	}

	.wc-block-gateway-input {
		@include font-size(regular);
		line-height: 1.375; // =22px when font-size is 16px.
		background-color: #fff;
		padding: em($gap-small) 0 em($gap-small) $gap;
		border-radius: 4px;
		border: 1px solid $input-border-gray;
		width: 100%;
		font-family: inherit;
		margin: 0;
		box-sizing: border-box;
		height: 3em;
		color: $input-text-active;
		cursor: text;

		&:focus {
			background-color: #fff;
		}
	}

	&:focus {
		background-color: #fff;
	}

	label {
		@include reset-typography();
		@include font-size(regular);
		line-height: 1.375; // =22px when font-size is 16px.
		position: absolute;
		transform: translateY(0.75em);
		left: 0;
		top: 0;
		transform-origin: top left;
		color: $gray-700;
		transition: transform 200ms ease;
		margin: 0 0 0 #{$gap + 1px};
		overflow: hidden;
		text-overflow: ellipsis;
		max-width: calc(100% - #{$gap + $gap-smaller});
		cursor: text;

		@media screen and (prefers-reduced-motion: reduce) {
			transition: none;
		}
	}

	&.wc-inline-card-element {
		label {
			// $gap is the padding of the input box, 1.5em the width of the card
			// icon and $gap-smaller the space between the card
			// icon and the label.
			margin-left: calc(#{$gap + $gap-smaller} + 1.5em);
		}
		.wc-block-gateway-input.focused.empty,
		.wc-block-gateway-input:not(.empty) {
			& + label {
				margin-left: $gap;
				transform: translateY(#{$gap-smallest}) scale(0.75);
			}
		}
		& + .wc-block-components-validation-error {
			position: static;
			margin-top: -$gap-large;
		}
	}

	.wc-block-gateway-input.focused.empty,
	.wc-block-gateway-input:not(.empty) {
		padding: em($gap-large) 0 em($gap-smallest) $gap;
		& + label {
			transform: translateY(#{$gap-smallest}) scale(0.75);
		}
	}

	.wc-block-gateway-input.has-error {
		border-color: $alert-red;
		&:focus {
			outline-color: $alert-red;
		}
	}

	.wc-block-gateway-input.has-error + label {
		color: $alert-red;
	}
}

// These elements have available space below, so we can display errors with a
// larger line height.
.is-medium,
.is-large {
	.wc-card-expiry-element,
	.wc-card-cvc-element {
		.wc-block-components-validation-error > p {
			line-height: 16px;
			padding-top: 4px;
		}
	}
}

.is-mobile,
.is-small {
	.wc-card-expiry-element,
	.wc-card-cvc-element {
		.wc-block-components-validation-error > p {
			min-height: 28px;
		}
	}
}

.wc-block-components-checkout-payment-methods * {
	pointer-events: all; // Overrides parent disabled component in editor context
}

.is-mobile,
.is-small {
	.wc-block-card-elements {
		flex-wrap: wrap;
	}

	.wc-block-gateway-container.wc-card-number-element {
		flex-basis: 100%;
	}

	.wc-block-gateway-container.wc-card-expiry-element {
		flex-basis: calc(50% - #{$gap-smaller});
		margin-left: 0;
		margin-right: $gap-smaller;
	}

	.wc-block-gateway-container.wc-card-cvc-element {
		flex-basis: calc(50% - #{$gap-smaller});
		margin-left: $gap-smaller;
	}
}

.wc-block-checkout__payment-method {
	.wc-block-components-radio-control__option {
		padding-left: 56px;

		&::after {
			content: none;
		}

		.wc-block-components-radio-control__input {
			left: 16px;
		}
	}

	// We need to add the first-child and last-child pseudoclasses for specificity.
	.wc-block-components-radio-control__option,
	.wc-block-components-radio-control__option:first-child,
	.wc-block-components-radio-control__option:last-child {
		margin: 0;
		padding-bottom: em($gap);
		padding-top: em($gap);
	}

	.wc-block-components-radio-control__option-checked {
		font-weight: bold;
	}

	.wc-block-components-radio-control-accordion-option,
	.wc-block-components-radio-control__option {
		@include with-translucent-border(1px 1px 0 1px);
	}

	.wc-block-components-radio-control__option:last-child::after,
	.wc-block-components-radio-control-accordion-option:last-child::after {
		border-width: 1px;
	}

	.wc-block-components-radio-control-accordion-option {
		.wc-block-components-radio-control__option::after {
			border-width: 0;
		}
		.wc-block-components-radio-control__label {
			display: flex;
			align-items: center;
			justify-content: flex-start;
		}
		.wc-block-components-radio-control__label img {
			height: 24px;
			max-height: 24px;
			object-fit: contain;
			object-position: left;
		}
	}

	.wc-block-components-radio-control.disable-radio-control {
		.wc-block-components-radio-control__option {
			padding-left: 16px;
		}

		.wc-block-components-radio-control__input {
			display: none;
		}
	}

	.wc-block-components-checkout-step__description-payments-aligned {
		padding-top: 14px;
		height: 28px;
	}

}

.wc-block-components-radio-control-accordion-content {
	padding: 0 $gap em($gap) $gap;

	&:empty {
		display: none;
	}
}

.wc-block-checkout__order-notes {
	.wc-block-components-checkout-step__content {
		padding-bottom: 0;
	}
}