.youtube {
position: relative;
padding-bottom: 56.25%; /*アスペクト比 16:9の場合の縦幅*/
height: 0;
overflow: hidden;
text-align: center;
}
.youtube iframe {
position: absolute;
top: 0;
left: 0;
width: 100%;
height: 100%;
}

.movie {
width: 70%;
margin: 0 auto;
}

.movie .title {
font-size: 1em;
color: #fff;
}