body {
  font-size: 200%;
  font: 100% arial, helvetica, sans-serif;
  line-height: 1.5;
  margin: 0;
}

/* 发光 */
#faguang a {
  opacity: .8;
}
#faguang a:hover {
  opacity: 1;
}

/* 侧边栏 */
#sb {

  position: absolute;
  left: 0;
  width: 29%;
}

/* 主内容 */
#mc {
  border: 2px dashed #ccc;
  margin: 0 auto;
  padding: 20px;
  width: 60%;
  box-sizing: border-box;  /* padding算在宽度内，不会溢出 */
  word-wrap: break-word;    /* 长单词自动换行 */
  overflow-wrap: break-word;
}

/* 窗口小于1000px时：隐藏侧边栏，主内容占满 */
@media screen and (max-width: 1000px) {
  #sb {
    display: none;
  }
  #mc {
    width: 100%;
    margin-left: 0;
    box-sizing: border-box;
    word-wrap: break-word;
    overflow-wrap: break-word;
  }
}