body {
        font-family: Tahoma, Arial, Roboto, "Droid Sans", "Helvetica Neue", "Droid Sans Fallback", "Heiti SC", "Hiragino Sans GB", Simsun, sans-self;
		text-autospace: normal; 
      }
      .transition-all {
        transition: all 0.3s ease;
      }

  a {
    text-decoration: none; /* 默认无下划线 */
  }
  a:hover {
    text-decoration: underline; /* 鼠标悬停时显示下划线 */
  }
img,picture img {
  border-radius: 5px;
  display: block;
}