/* body{
    background: url('https://images.cnblogs.com/cnblogs_com/yfworld/2004159/o_210723093439bg3.png');
}*/
#header{
    position:sticky;
    top:0;
    z-index: 1000;
} 


#sidebar_toptags ul {
  width: 200px;
}
#sidebar_toptags ul {
  list-style: none;
  padding-left: 0;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: center;
  line-height: 2.5rem;
}
#sidebar_toptags ul a {
  //color: #a33;
  display: block;
  font-size: 1.5rem;
  padding: 0.125rem 0.25rem;
  text-decoration: none;
  position: relative;
}
#sidebar_toptags ul a[data-weight='1'] {
  --size: 1;
}
#sidebar_toptags ul a[data-weight='2'] {
  --size: 2;
}
#sidebar_toptags ul a[data-weight='3'] {
  --size: 3;
}
#sidebar_toptags ul a[data-weight='4'] {
  --size: 4;
}
#sidebar_toptags ul a[data-weight='5'] {
  --size: 5;
}
#sidebar_toptags ul a[data-weight='6'] {
  --size: 6;
}
#sidebar_toptags ul a[data-weight='7'] {
  --size: 7;
}
#sidebar_toptags ul a[data-weight='8'] {
  --size: 8;
}
#sidebar_toptags ul a[data-weight='9'] {
  --size: 9;
}

#sidebar_toptags ul a {
  --size: 4;
  font-size: calc(var(--size) * 0.25rem + 0.5rem);
  /* ... */
}
#sidebar_toptags ul[data-show-value] a::after {
  content: ' (' attr(data-weight) ')';
  font-size: 1rem;
}
#sidebar_toptags ul li:nth-child(2n + 1) a {
  color: #181;
}
#sidebar_toptags ul li:nth-child(3n + 1) a {
  color: #33a;
}
#sidebar_toptags ul li:nth-child(4n + 1) a {
  color: orange;
}
#sidebar_toptags ul a:focus {
  outline: 1px dashed;
}
#sidebar_toptags ul a::before {
  content: '';
  position: absolute;
  top: 0;
  left: 50%;
  width: 0;
  height: 100%;
  background: var(--color);
  transform: translate(-50%, 0);
  opacity: 0.15;
  transition: width 0.25s;
}

#sidebar_toptags ul a:focus::before,
#sidebar_toptags ul a:hover::before {
  width: 100%;
}