.article-video {
  position: relative;
  display: inline-block;
  text-decoration: none;
  overflow: hidden;
  border: 4px solid rgba(255,255,255,0.3);
  border-radius: 10px;
  transition: border-color .3s ease;
}

.article-video:hover { border-color: rgba(255,255,255,.6); }

.article-video img {
  display: block;
  width: 100%;
  height: auto;
  transition: filter .3s ease;
}

.article-video:hover img { filter: brightness(.8); }

/* Okrąg */
.article-video::before {
  content: '';
  position: absolute;
  top: 50%; left: 50%;
  width: 80px; height: 80px;
  transform: translate(-50%, -50%);
  background: rgba(0,0,0,.5);
  border: 2px solid rgba(255,255,255,.6);
  border-radius: 50%;
  transition: all .3s ease;
  z-index: 2;
}

/* Trójkąt */
.article-video::after {
  content: '';
  position: absolute;
  top: 50%; left: 50%;
  transform: translate(-50%, -50%);
  width: 0; height: 0;
  border-left: 24px solid rgba(255,255,255,.85);
  border-top: 14px solid transparent;
  border-bottom: 14px solid transparent;
  transition: border-left-color .3s ease;
  z-index: 3;
}

.article-video:hover::before {
  background: rgba(0,0,0,.7);
  border-color: rgba(255,255,255,1);
  transform: translate(-50%, -50%) scale(1.1);
}
.article-video:hover::after { border-left-color: rgba(255,255,255,1); }