/**
 * File              : extra.css
 * Author            : haoyi <haoyi@buaa.edu.cn>
 * Date              : 28.07.2021
 * Last Modified Date: 28.07.2021
 */

body {
  overflow-y: scroll;
  scrollbar-width: none; /* Firefox */
  -ms-overflow-style: none;  /* Internet Explorer 10+ */
}
body::-webkit-scrollbar { /* WebKit */
  width: 0;
  height: 0;
  display: none;
}

.hlText {
  color: red;
}

hline {
    display: block;
    margin-top: 2.5em;
    margin-bottom: 0.5em;
    margin-left: auto;
    margin-right: auto;
    border-style: inset;
    border-width: .5px;
}

#button {
    display: inline-block;
    background-color: #FF9800;
    width: 50px;
    height: 50px;
    text-align: center;
    border-radius: 25px;
    position: fixed;
    bottom: 30px;
    right: 30px;
    transition: background-color .3s, 
      opacity .5s, visibility .5s;
    opacity: 0;
    visibility: hidden;
    z-index: 1000;
    text-decoration: none;
}
#button::after {
  content: "\f077";
  font-family: FontAwesome;
  font-weight: normal;
  font-style: normal;
  font-size: 2em;
  line-height: 50px;
  color: #fff;
}
@media (any-hover: hover){
  #button:hover {
    cursor: pointer;
    background-color: #333;
  }
}
#button:active {
  background-color: #555;
}
#button.show {
  opacity: 1;
  visibility: visible;
}