first

wp-content/themes/twentynineteen/sass/forms/_buttons.scss

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+.button,
+button,
+input[type="button"],
+input[type="reset"],
+input[type="submit"] {
+
+	@include button-transition;
+	background: $color__background-button;
+	border: none;
+	border-radius: 5px;
+	box-sizing: border-box;
+	color: $color__background-body;
+	@include font-family( $font__heading );
+	font-size: $font__size-sm;
+	font-weight: 700;
+	line-height: $font__line-height-heading;
+	outline: none;
+	padding: ( $size__spacing-unit * .76 ) $size__spacing-unit;
+	text-decoration: none;
+	vertical-align: bottom;
+
+	&:hover {
+		background: $color__background-button-hover;
+		cursor: pointer;
+	}
+
+	&:visited {
+		color: $color__background-body;
+		text-decoration: none;
+	}
+
+	&:focus {
+		background: $color__background-button-hover;
+		outline: thin dotted;
+		outline-offset: -4px;
+	}
+}

wp-content/themes/twentynineteen/sass/forms/_fields.scss

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+input[type="text"],
+input[type="email"],
+input[type="url"],
+input[type="password"],
+input[type="search"],
+input[type="number"],
+input[type="tel"],
+input[type="range"],
+input[type="date"],
+input[type="month"],
+input[type="week"],
+input[type="time"],
+input[type="datetime"],
+input[type="datetime-local"],
+input[type="color"],
+textarea {
+	-webkit-backface-visibility: hidden;
+	background: $color__background-input;
+	border: solid 1px $color__border;
+	box-sizing: border-box;
+	outline: none;
+	padding: #{.36 * $size__spacing-unit} #{.66 * $size__spacing-unit};
+	-webkit-appearance: none;
+	outline-offset: 0;
+	border-radius: 0;
+
+	&:focus {
+		border-color: $color__link;
+		outline: thin solid rgba( $color__link, 0.15 );
+		outline-offset: -4px;
+	}
+}
+
+input[type="search"] {
+	&::-webkit-search-decoration {
+		display: none;
+	}
+}
+
+select {
+
+}
+
+textarea {
+	box-sizing: border-box;
+	display: block;
+	width: 100%;
+	max-width: 100%;
+	resize: vertical;
+}
+
+form {
+
+	p {
+		margin: $size__spacing-unit 0;
+	}
+
+}

wp-content/themes/twentynineteen/sass/forms/_forms.scss

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+@import "buttons";
+
+@import "fields";