.bonzini-video{
  max-width: 900px;
  width: 100%;
  margin: 40px auto;
  position: relative;
  height: 0;
  padding-bottom: 56.25%;
  overflow: hidden;
  clear: both;
}

.bonzini-video iframe{
  position: absolute;
  top: 0;
  left: 0;
  display: block;
  width: 100%;
  height: 100%;
  border: 0;
}

@media (max-width: 767px){
  .bonzini-video{
    max-width: 100%;
    width: 100%;
    margin: 24px auto;
    padding-bottom: 56.25%;
  }

  .bonzini-video iframe{
    width: 100% !important;
    height: 100% !important;
  }
}