html, body {
  margin: 0;
  padding: 0;
}

.container {
  display: flex;
  align-items: center;
  justify-content: center;
}
.mainvisual {
  position: relative;
  width: 700px;
}
.video {
  width: 100%;
}
.contents {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
}
.title {
  background-color: #fff;
  color: #000;
  display: inline-block;
  padding: 20px;
}