html,
body {
  height: 100%;
  padding: 0;
  margin: 0;
  overflow: hidden;
}
.instruction {
  height: calc(100% - 88px);
  display: flex;
  min-width: 960px;
}
/* .instruction * {
  box-sizing: border-box;
} */
h1,h2,h3,h4,h5,h6 {
  padding:7px 0;
  font-weight: 600;
}
h1{
  font-size: 28px; 
}
h3{
  font-size: 20px;
}
.menu {
  padding-top: 32px;
  overflow-x: hidden;
  background-color: #fafafa;
  border-right: 1px solid #e8e8e8;
  padding-left: calc((100% - 1700px) / 2);
  position: relative;
  flex: 0 0 auto;
  width: calc((100% - 1500px) / 2);
  min-width: 250px;
  height: 100%;
}
.menu nav {
  min-width: 260px;
}

.menu nav ul {
  padding-left: 25px;
}
.menu nav > ul {
  padding-left: 0;
}
.menu .list-out-title {
  background: url(../img/Instructions/arrow-right.png) no-repeat 10px 4px;
  background-size: 16px;
}
.menu .list-out-title.list-down-title {
  background: url(../img/Instructions/arrow.png) no-repeat 10px 4px;
  background-size: 16px;
}
.menu .list-out {
  display: none;
}
.menu li {
  list-style-type: none;
  font-size: 14px;
}
.menu a {
  width: calc(100% - 36px);
  padding-left: 26px;
  display: inline-block;
  height: 25px;
  color: #333333;
  line-height: 25px;
  text-decoration: none;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}
.menu a.active {
  color: #1798FC;
}

.content {
  padding-top: 32px;
  padding-left: 36px;
  padding-bottom: 48px;
  background-color: #fff;
  flex: 1;
}
.menu,
.content {
  overflow-y: auto;
}
.dialog-bg {
  display: none;
  position: absolute;
  top: 0;
  bottom: 0;
  left: 0;
  right: 0;
  background: rgba(0, 0, 0, 0.4);
}

#big-img-box {
  position: fixed;
  top: 50%;
  left: 50%;
  z-index: 100;
}

.footer {
  display: none;
}

strong {
  font-size: medium;
  position: static;
}