Scott (@scottsweb)

Fillet adds a new IFrame button to the toolbar in the WordPress visual editor. By using a <a href="https://codex.wordpress.org/Shortcode" rel="nofollow ugc">shortcode</a>, it allows for safer, responsive and future proof embeds.
The chosen width and height for an IFrame embed is converted into a ratio which is used to scale your embeds across different devices.
<a href="http://scott.ee/" title="WordPress web design Hampshire" rel="nofollow ugc">a plugin by Scott Evans</a>

fillet

Safely embed responsive IFrames in the WordPress text editor.

jessai

peggy

Just put frame on your picture when the mousse hover. You can choose color and width of border and padding. 
When mouse on the image it change padding color.
Now you can choose the type of border

frame-image

Just put frame on your picture when the mouse hover.

fillet vs frame-image