h {
  text-align: center;
}

h1 {
  text-align: center;
}

h2 {
  text-align: center;
}

h3 {
  text-align: center;
}

table{
  margin: auto;  /* 居中 */
}

img{
  /* 居中 */
  display: block;
  margin: auto;  
}

figure {
  /* 居中。图片描述居中，且宽度对齐。*/
    display: flex;
    flex-direction: column;
    align-items: center;
}

/* 用圓角邊框包圍tips */
.tips {
  border-radius: 4px;
  border: 1px solid darkslategray;
  padding-left: 1em;
  padding-right: 1em;
}

/* pandoc-eqnos: equation style */
.eqnos { display: inline-block; position: relative; width: 100%; }
.eqnos br { display: none; }
.eqnos-number { position: absolute; right: 0em; top: 50%; line-height: 0; }