Edit: buttons.css

/* ----------------------------------------------------------------------------

NOTE: If you edit this file, you should make sure that the CSS rules for
buttons in the following files are updated.

* jquery-ui-dialog.css
* editor.css

WordPress-style Buttons
=======================
Create a button by adding the `.button` class to an element. For backward
compatibility, we support several other classes (such as `.button-secondary`),
but these will *not* work with the stackable classes described below.

Button Styles
-------------
To display a primary button style, add the `.button-primary` class to a button.

Button Sizes
------------
Adjust a button's size by adding the `.button-large` or `.button-small` class.

Button States
-------------
Lock the state of a button by adding the name of the pseudoclass as
an actual class (e.g. `.hover` for `:hover`).

TABLE OF CONTENTS:
------------------
 1.0 - Button Layouts
 2.0 - Default Button Style
 3.0 - Primary Button Style
 4.0 - Button Groups
 5.0 - Responsive Button Styles

---------------------------------------------------------------------------- */

/* ----------------------------------------------------------------------------
  1.0 - Button Layouts
---------------------------------------------------------------------------- */

.wp-core-ui .button,
.wp-core-ui .button-primary,
.wp-core-ui .button-secondary {
	display: inline-block;
	text-decoration: none;
	font-size: 13px;
	line-height: 2.15384615; /* 28px */
	min-height: 30px;
	margin: 0;
	padding: 0 10px;
	cursor: pointer;
	border-width: 1px;
	border-style: solid;
	-webkit-appearance: none;
	border-radius: 3px;
	white-space: nowrap;
	box-sizing: border-box;
}

/* Remove the dotted border on :focus and the extra padding in Firefox */
.wp-core-ui button::-moz-focus-inner,
.wp-core-ui input[type="reset"]::-moz-focus-inner,
.wp-core-ui input[type="button"]::-moz-focus-inner,
.wp-core-ui input[type="submit"]::-moz-focus-inner {
	border-width: 0;
	border-style: none;
	padding: 0;
}

.wp-core-ui .button.button-large,
.wp-core-ui .button-group.button-large .button {
	min-height: 32px;
	line-height: 2.30769231; /* 30px */
	padding: 0 12px;
}

.wp-core-ui .button.button-small,
.wp-core-ui .button-group.button-small .button {
	min-height: 26px;
	line-height: 2.18181818; /* 24px */
	padding: 0 8px;
	font-size: 11px;
}

.wp-core-ui .button.button-hero,
.wp-core-ui .button-group.button-hero .button {
	font-size: 14px;
	min-height: 46px;
	line-height: 3.14285714;
	padding: 0 36px;
}

.wp-core-ui .button.hidden {
	display: none;
}

/* Style Reset buttons as simple text links */

.wp-core-ui input[type="reset"],
.wp-core-ui input[type="reset"]:hover,
.wp-core-ui input[type="reset"]:active,
.wp-core-ui input[type="reset"]:focus {
	background: none;
	border: none;
	box-shadow: none;
	padding: 0 2px 1px;
	width: auto;
}

/* ----------------------------------------------------------------------------
  2.0 - Default Button Style
---------------------------------------------------------------------------- */

.wp-core-ui .button,
.wp-core-ui .button-secondary {
	color: #2271b1;
	border-color: #2271b1;
	background: #f6f7f7;
	vertical-align: top;
}

.wp-core-ui p .button {
	vertical-align: baseline;
}

.wp-core-ui .button.hover,
.wp-core-ui .button:hover,
.wp-core-ui .button-secondary:hover{
	background: #f0f0f1;
	border-color: #0a4b78;
	color: #0a4b78;
}

.wp-core-ui .button.focus,
.wp-core-ui .button:focus,
.wp-core-ui .button-secondary:focus {
	background: #f6f7f7;
	border-color: #3582c4;
	color: #0a4b78;
	box-shadow: 0 0 0 1px #3582c4;
	/* Only visible in Windows High Contrast mode */
	outline: 2px solid transparent;
	/* Reset inherited offset from Gutenberg */
	outline-offset: 0;
}

/* :active state */
.wp-core-ui .button:active,
.wp-core-ui .button-secondary:active {
	background: #f6f7f7;
	border-color: #8c8f94;
	box-shadow: none;
}

/* pressed state e.g. a selected setting */
.wp-core-ui .button.active,
.wp-core-ui .button.active:hover {
	background-color: #dcdcde;
	color: #135e96;
	border-color: #0a4b78;
	box-shadow: inset 0 2px 5px -3px #0a4b78;
}

.wp-core-ui .button.active:focus {
	border-color: #3582c4;
	box-shadow:
		inset 0 2px 5px -3px #0a4b78,
		0 0 0 1px #3582c4;
}

.wp-core-ui .button[disabled],
.wp-core-ui .button:disabled,
.wp-core-ui .button.disabled,
.wp-core-ui .button-secondary[disabled],
.wp-core-ui .button-secondary:disabled,
.wp-core-ui .button-secondary.disabled,
.wp-core-ui .button-disabled {
	color: #a7aaad !important;
	border-color: #dcdcde !important;
	background: #f6f7f7 !important;
	box-shadow: none !important;
	cursor: default;
	transform: none !important;
}

.wp-core-ui .button[aria-disabled="true"],
.wp-core-ui .button-secondary[aria-disabled="true"] {
	cursor: default;
}

/* Buttons that look like links, for a cross of good semantics with the visual */
.wp-core-ui .button-link {
	margin: 0;
	padding: 0;
	box-shadow: none;
	border: 0;
	border-radius: 0;
	background: none;
	cursor: pointer;
	text-align: left;
	/* Mimics the default link style in common.css */
	color: #2271b1;
	text-decoration: underline;
	transition-property: border, background, color;
	transition-duration: .05s;
	transition-timing-function: ease-in-out;
}

.wp-core-ui .button-link:hover,
.wp-core-ui .button-link:active {
	color: #135e96;
}

.wp-core-ui .button-link:focus {
	color: #043959;
	box-shadow: 0 0 0 2px #2271b1;
	/* Only visible in Windows High Contrast mode */
	outline: 2px solid transparent;
}

.wp-core-ui .button-link-delete {
	color: #d63638;
}

.wp-core-ui .button-link-delete:hover,
.wp-core-ui .button-link-delete:focus {
	color: #d63638;
	background: transparent;
}

.wp-core-ui .button-link-delete:disabled {
	/* overrides the default buttons disabled background */
	background: transparent !important;
}

/* ----------------------------------------------------------------------------
  3.0 - Primary Button Style
---------------------------------------------------------------------------- */

.wp-core-ui .button-primary {
	background: #2271b1;
	border-color: #2271b1;
	color: #fff;
	text-decoration: none;
	text-shadow: none;
}

.wp-core-ui .button-primary.hover,
.wp-core-ui .button-primary:hover,
.wp-core-ui .button-primary.focus,
.wp-core-ui .button-primary:focus {
	background: #135e96;
	border-color: #135e96;
	color: #fff;
}

.wp-core-ui .button-primary.focus,
.wp-core-ui .button-primary:focus {
	box-shadow:
		0 0 0 1px #fff,
		0 0 0 3px #2271b1;
}

.wp-core-ui .button-primary.active,
.wp-core-ui .button-primary.active:hover,
.wp-core-ui .button-primary.active:focus,
.wp-core-ui .button-primary:active {
	background: #135e96;
	border-color: #135e96;
	box-shadow: none;
	color: #fff;
}

.wp-core-ui .button-primary[disabled],
.wp-core-ui .button-primary:disabled,
.wp-core-ui .button-primary-disabled,
.wp-core-ui .button-primary.disabled {
	color: #a7aaad !important;
	background: #f6f7f7 !important;
	border-color: #dcdcde !important;
	box-shadow: none !important;
	text-shadow: none !important;
	cursor: default;
}

.wp-core-ui .button-primary[aria-disabled="true"] {
	cursor: default;
}

/* ----------------------------------------------------------------------------
  4.0 - Button Groups
---------------------------------------------------------------------------- */

.wp-core-ui .button-group {
	position: relative;
	display: inline-block;
	white-space: nowrap;
	font-size: 0;
	vertical-align: middle;
}

.wp-core-ui .button-group > .button {
	display: inline-block;
	border-radius: 0;
	margin-right: -1px;
}

.wp-core-ui .button-group > .button:first-child {
	border-radius: 3px 0 0 3px;
}

.wp-core-ui .button-group > .button:last-child {
	border-radius: 0 3px 3px 0;
}

.wp-core-ui .button-group > .button-primary + .button {
	border-left: 0;
}

.wp-core-ui .button-group > .button:focus {
	position: relative;
	z-index: 1;
}

/* pressed state e.g. a selected setting */
.wp-core-ui .button-group > .button.active {
	background-color: #dcdcde;
	color: #135e96;
	border-color: #0a4b78;
	box-shadow: inset 0 2px 5px -3px #0a4b78;
}

.wp-core-ui .button-group > .button.active:focus {
	border-color: #3582c4;
	box-shadow:
		inset 0 2px 5px -3px #0a4b78,
		0 0 0 1px #3582c4;
}

/* ----------------------------------------------------------------------------
  5.0 - Responsive Button Styles
---------------------------------------------------------------------------- */

@media screen and (max-width: 782px) {

.wp-core-ui .button,
	.wp-core-ui .button.button-large,
	.wp-core-ui .button.button-small,
	input#publish,
	input#save-post,
	a.preview {
		padding: 0 14px;
		line-height: 2.71428571; /* 38px */
		font-size: 14px;
		vertical-align: middle;
		min-height: 40px;
		margin-bottom: 4px;
	}

/* Copy attachment URL button in the legacy edit media page. */
	.wp-core-ui .copy-to-clipboard-container .copy-attachment-url {
		margin-bottom: 0;
	}

#media-upload.wp-core-ui .button {
		padding: 0 10px 1px;
		min-height: 24px;
		line-height: 22px;
		font-size: 13px;
	}

.media-frame.mode-grid .bulk-select .button {
		margin-bottom: 0;
	}

/* Publish Metabox Options */
	.wp-core-ui .save-post-status.button {
		position: relative;
		margin: 0 14px 0 10px; /* 14px right margin to match all other buttons */
	}

/* Reset responsive styles in Press This, Customizer */

.wp-core-ui.wp-customizer .button {
		font-size: 13px;
		line-height: 2.15384615; /* 28px */
		min-height: 30px;
		margin: 0;
		vertical-align: inherit;
	}

.wp-customizer .theme-overlay .theme-actions .button {
		margin-bottom: 5px;
	}

.media-modal-content .media-toolbar-primary .media-button {
		margin-top: 10px;
		margin-left: 5px;
	}

/* Reset responsive styles on Log in button on iframed login form */

.interim-login .button.button-large {
		min-height: 30px;
		line-height: 2;
		padding: 0 12px 2px;
	}

}

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