.center-block {
    margin: 0 auto;
    width: 350px;
    display: block;
}

p {
	text-align:center;
}


img {
	width: 80%;
	height: auto;
}

.embed-container {
  height: 0;
  overflow: hidden;
  max-width: 100%;
  padding-bottom: 56.25%; /* 16:9 の高さなので 56.25% (= 9 ÷ 16) */
  position: relative;
}

.embed-container iframe {
  height: 80%;
  left: 0;
  position: absolute;
  top: 0;
  width: 80%;
}