@keyframes shine{
from{border-color: rgba(0,0,0,0)}
to{border-color: rgba(0,0,0,1)}
}
div{width: 200pxheight: 200pxbackground: #dadadaborder:5px solid redanimation: shine 1s alternate infinite}@keyframes shine{
from{border-color: rgba(0,0,0,0)}
to{border-color: rgba(0,0,0,1)}
}