Here’s a general idea of what @strawberry-3-141 and @yawns are talking about:
Before frame:
After adding frame to css:
I did this by adding this to my own css file:
border-style: solid;
border-width: 6px 5px 7px 4px;
-moz-border-image: url(https://forum.magicmirror.builders/assets/uploads/files/1500968912312-14284711641_ba88f4c074_o.jpg) 6 5 7 4 stretch;
-webkit-border-image: url(https://forum.magicmirror.builders/assets/uploads/files/1500968912312-14284711641_ba88f4c074_o.jpg) 6 5 7 4 stretch;
-o-border-image: url(https://forum.magicmirror.builders/assets/uploads/files/1500968912312-14284711641_ba88f4c074_o.jpg) 6 5 7 4 stretch;
border-image: url(https://forum.magicmirror.builders/assets/uploads/files/1500968912312-14284711641_ba88f4c074_o.jpg) 6 5 7 4 fill stretch;
padding-top: 50px;
padding-bottom: 50px;
}