* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}
ul li {
  list-style: none;
}
ul li a {
  text-decoration: none;
}
header {
  position: sticky;
  top: 0;
  z-index: 9;
}
#container {
  display: flex;
  flex-direction: column;
  min-height: 100vh;
}
#container #nav {
  width: 60rem;
  margin: 0 auto;
  text-align: center;
}
#container #header {
  position: sticky;
  top: 0;
  z-index: 9;
}
#container #content {
  text-align: center;
}
#container #content .top_tips {
  margin: 20px auto;
  border-bottom: 4px solid #115899;
  padding-bottom: 10px;
  color: #115899;
  display: inline-block;
}
#container #content .picList {
  display: flex;
  flex-wrap: wrap;
}
#container #content .picList li .show-img-list {
  height: 200px;
  width: 250px;
  display: inline-block;
  box-shadow: 0 0 0.53125rem #0000004d;
  border-radius: 5px;
  margin: 25px;
}
#container #content .picList li .img_list {
  width: 100%;
  height: 100%;
  object-fit: contain;
}
#container #footer {
  margin-top: auto;
}
@media (max-width: 68.75rem) {
  #container #footer {
    display: none;
    transition: 0.3s;
  }
  #container #rightside {
    display: none;
    transition: 0.3s;
  }
}
footer {
  margin-top: auto;
}
@media (max-width: 68.75rem) {
  footer {
    display: none;
  }
  #rightside {
    display: none;
  }
}