Image before widget title

This code will add the image before the title of the widget, but you’d need to figure out how to drill down further since they all have the same css class settings.

h3.widgettitle::before {
    content: url("https://irinasopas.com/wp-content/uploads/2019/05/facebook.svg");
}

Oh, I didn’t even notice that; then sure here you go:

#custom_html-2 h3.widgettitle::before {
    content: url("https://irinasopas.com/wp-content/uploads/2019/05/facebook.svg");
}

Just be sure to change the widget ID and the image URL.

You can add this which will size all of them:

h3.widgettitle::before {
    display: block;
    height: 50px;
    width: 50px;
    margin: 0 auto;
}

You can adjust the height/width to your liking.