editor.css

.button-icon-picker .components-panel__row:not(:nth-child(2)) {
	margin-top: 16px;
}
.button-icon-picker .button-icon-picker__grid {
	  border: 1px solid rgb(148, 148, 148);
	  border-radius: 2px;
	  padding: 2px;
	  width: 100%;
}

.components-button.button-icon-picker__button {
	justify-content:center;
}

.components-button.button-icon-picker__button svg {
    height: 20px;
    width: 20px;
    object-fit: contain;
}

.wp-block-button[class*=has-icon__] .wp-block-button__link::after {
	content: "";
}
.wp-block-button[class*=has-icon__] .wp-block-button__link::after, .wp-block-button[class*=has-icon__] .wp-block-button__link::before {
	display: inline-block;
	background-color: currentColor;
	-webkit-mask-size: contain;
	mask-size: contain;
	-webkit-mask-position: center;
	mask-position: center;
	-webkit-mask-repeat: no-repeat;
	mask-repeat: no-repeat;
	height: 1em;
	width: 1em;
	mask-image: url("data:image/svg+xml;utf8,<svg width=%2710%27 height=%2718%27 xmlns=%27http://www.w3.org/2000/svg%27><polygon points=%271.81818182 0 0 1.5 6.96969697 9 0 16.5 1.81818182 18 10 9%27></polygon></svg>");
	-webkit-mask-image: url("data:image/svg+xml;utf8,<svg width=%2710%27 height=%2718%27 xmlns=%27http://www.w3.org/2000/svg%27><polygon points=%271.81818182 0 0 1.5 6.96969697 9 0 16.5 1.81818182 18 10 9%27></polygon></svg>");
}

.wp-block-button[class*=has-icon__].has-icon-position__left .wp-block-button__link::after {
	content: none;
}
.wp-block-button[class*=has-icon__].has-icon-position__left .wp-block-button__link::before {
	content: "";
}