.youtubebox{
  max-width: 560px;
  max-height: 360px;
}

.youtube{
  max-width: 560px;
  max-height: 360px;
  position: relative;
  width: 100%;
  padding-top: 56.25%;
}

.youtube iframe{
  position: absolute;
  top: 0;
  right: 0;
  width: 100% !important;
  height: 100% !important;
}

.youtube4x3box{
  max-width: 420px;
  max-height: 320px;
}

.youtube4x3{
  max-width: 420px;
  max-height: 320px;
  position: relative;
  width: 100%;
  padding-top: 75%;
}

.youtube4x3 iframe{
  position: absolute;
  top: 0;
  right: 0;
  width: 100% !important;
  height: 100% !important;
}

pre{
  white-space: -moz-pre-wrap; /* Mozilla */
  white-space: -pre-wrap;     /* Opera 4-6 */
  white-space: -o-pre-wrap;   /* Opera 7 */
  white-space: pre-wrap;      /* CSS3 */
  word-wrap: break-word;      /* IE 5.5+ */
}