body {
  font-family: 'ubuntu', serif;
  /* 设置字重 */
  font-weight: normal;
  /* 设置行高 */
  line-height: 1.5;

  /* 我的小癖好 */
  margin: 0;
  padding: 0;
  background-color: #f4f4f4;

}

hr {
  border: 0;
  border-top: 3px double #aaa;
  margin: 20px 0;
  margin-bottom: 30px;
}


.container {
  max-width: 700px;
  margin: 0px auto;
  padding: 20px;
  background-color: #fff;
  box-shadow: 10 10 20px rgba(0, 0, 0, 0.1);
}

.title {
  /* 我的小癖好 */
  font-size: 40px;
  color: #333;
  text-align: center;
  font-family: 'Times New Roman';
}

.p {
  color: #555;
  margin-bottom: 20px;
}

img {
  max-width: 90%;
  height: auto;
  display: block;
  margin: 0px auto;
}

.main-text {
  font-weight: lighter;
}

h2 {
  font-weight: normal;

}

ul li {
  font-weight: lighter;
}

strong {
  font-weight: normal;
}

.intro {
  color: #555;
  font-family: 'Times New Roman';
  font-size: 18px;
}

.video {
  width: 560px;
  height: 315px;
  margin: 20px auto;
  padding-bottom: 35px;
  margin-top: 10px;
}

.PartLabel {
  text-align: center;
  font-size: 30px;
  font-family: 'Times New Roman', Times, serif;
  font-weight: bolder;
  margin-top: 0px;
  margin-bottom: 0px;
  padding-bottom: 0px;

}

.firstpic {
  margin-top: 20px;
}