.u-youtube {
  position: relative;
  padding-bottom: 56.25%;
  height: 0;
  overflow: hidden;
}
.u-youtube iframe {
  width: 100%;
  position: absolute;
  top: 0;
  right: 0;
  width: 100% !important;
  height: 100% !important;
}

.u-blue {
  color:#0000ff;
}

.u-detail {
  background-color: #eeeeee;
  text-align: center;
  padding: 30px;
  margin-top: 2.1875rem;
}
.u-detail p {
  font-weight: bold;
  font-size: 1.2em;
  margin-bottom: 20px;
}
.u-detail a {
  display: block;
  background-color: #007e41;
  color: #fff;
  width: 60%;
  padding: 12px 30px;
  margin: 0 auto;
}
@media screen and (max-width: 767px){
  .u-detail a {
    width: 100%;
  }
}