app/assets/stylesheets/application/avatar.scss
#form_photo {
border: 0px;
padding: 0px;
margin-bottom: 0px;
}
#crop_panel {
position: absolute;
width: 200px;
height: 200px;
border-left: 4px dashed black;
cursor: move;
touch-action: none;
border-top: 4px dashed black;
}
#crop_panel::before {
content: "";
border-right: 4px dashed black;
position: absolute;
right: 0;
width: 16px;
height: 100%;
cursor: ew-resize;
}
#crop_panel::after {
content: "";
border-bottom: 4px dashed black;
position: absolute;
left: 0;
bottom: 0;
width: 100%;
height: 16px;
cursor: ns-resize;
}