Hello,

Please add this code to the Theme Settings > Custom CSS > Global:

div.widget_price_filter .price_slider_amount .price_label {
    display: -webkit-box;
    display: -ms-flexbox;
    display: flex;
    -webkit-box-orient: horizontal;
    -webkit-box-direction: reverse;
        -ms-flex-direction: row-reverse;
            flex-direction: row-reverse;
    font-size: 0;
}
div.widget_price_filter .price_slider_amount .price_label > span {
    font-size: 14px;
}
div.widget_price_filter .price_slider_amount .price_label > .from:before {
	content: "-";
	font-size: 14px;
	font-weight: 400;
	color: #777;
	margin: 0 8px;
}

Replace the code with this one:

.product-image-summary .single_add_to_cart_button.button.alt {
    width: 55% !important;
}

Best Regards