.mainContainer {
  margin: 0;
  padding: 1rem 0;
  position: relative;
}

iframe {
  border: 0;
}

.corner-ribbon-wrapper {
  position: absolute;
  width: 120px;
  height: 120px;
  left: -24px;
  top: 0;
  overflow: hidden;
}

.corner-ribbon {
  width: 200px;
  background: #2980b9;
  position: absolute;
  top: 25px;
  left: -55px;
  text-align: center;
  line-height: 28px;
  font-size: 13px;
  letter-spacing: 1px;
  color: #f0f0f0;
  text-decoration: none;
  box-shadow: 0 0 3px rgba(0,0,0,.3);
  transform: rotate(-45deg);
  -webkit-transform: rotate(-45deg);
}

.corner-ribbon:hover {
  background: #0056b3;
  color: #f0f0f0;
  text-decoration: none;
}