#nav-back {
	background-color:#035efc;
	width:100%;
	height:auto;
	margin:0 auto;
}

nav {
	display: block;
	max-width:1200px;
	/*text-align: center;*/
	margin:0 auto;
}

#nav {
	display:block;
  max-width: 1200px;
  height: 40px;
  margin: 0 auto;
  padding: 0;
  /*display: flex;*/
}
#nav li {
	font-family: Georgia, "Times New Roman", Times, serif;
	font-weight:normal;
	float:left;
  position: relative;
  list-style: none;
}
#nav li a {
  display: block;
  /*width: 150px;*/
  width: 160px;
  height: 40px;
  text-align: center;
  color: #fff;
  font-size: 14px;
  line-height: 2.8;
  background: #035efc;
  transition: 0.5s;
  text-decoration: none;
}
#nav li a:hover {
  color: #fff;
  background: #037ffc;
}
#nav > li li:hover > a {
  background: #029cf7;
}

@media screen and (min-width: 321px) and (max-width: 375px) {
#nav li a {
	width: 187px;/*2列*/
}
}

@media screen and (min-width: 376px) and (max-width: 414px) {
#nav li a {
	width: 207px;/*2列*/
}
}
@media screen and (min-width: 415px) and (max-width: 480px) {
#nav li a {
	width: 160px;/*3列*/
}
}
@media screen and (min-width: 481px) and (max-width: 568px) {
#nav li a {
	width: 189px;/*3列*/
}
}
@media screen and (min-width: 569px) and (max-width: 600px) {
#nav li a {
	width: 150px;/*4列*/
}
}
@media screen and (min-width: 601px) and (max-width: 667px) {
#nav li a {
	width: 166.5px;/*4列*/
}
}
@media screen and (min-width: 668px) and (max-width: 736px) {
#nav li a {
	width: 184px;/*4列*/
}
}
@media screen and (min-width: 737px) and (max-width: 768px) {
#nav li a {
	width: 192px;/*4列*/
}
}
@media screen and (min-width: 769px) and (max-width: 800px) {
#nav li a {
	width: 200px;/*4列*/
}
}
@media screen and (min-width: 801px) and (max-width: 1024px) {
#nav li a {
	width: 170.5px;/*6列*/
}
}
@media screen and (min-width: 1025px) and (max-width: 1080px) {
#nav li a {
	width: 180px;/*6列*/
}
}
@media screen and (min-width: 1081px) {
#nav li a {
	width: 150px;/*8列*/
}
}


#nav li ul {/*子*/
  top: 40px;
  left: 0px;
  position: absolute;
  z-index:100;
}
#nav li ul li {
  overflow: hidden;
  height: 0;
  transition: 0.2s;
}
#nav li ul li a {
	background:#6dc5f9;
  /*border-top: 1px solid #fff;*/
}
#nav li:hover > ul > li {
  overflow: visible;
  height: 40px;
}





  #nav li ul li ul {/*孫*/
    top: 0;
    left: 110px;
  }
  #nav li ul li ul:before {/*子▷*/
    position: absolute;
    content: "";
    top: 15px;
    left: 30px;
    border: 5px solid transparent;
    border-left: 5px solid #fff;
  }
  #nav li ul li ul li:hover > a,/*孫*/
  #nav li ul li ul li ul li:hover > a {/*ひ孫*/
    background: #afc6e2;
  }
  #nav li ul li ul.left {/*孫左*/
    top: 0;
    left: -190px;
  }
  #nav li ul li ul.left:before,/*子左▷*/
  #nav li ul li ul li ul.left:before {/*孫左▷*/
    position: absolute;
    content: "";
    top: 15px;
    left: 190px;
    border: 5px solid transparent;
    border-right: 5px solid #fff;
  }
  #nav li ul li ul.left li:hover > a,/*孫*/
  #nav li ul li ul li ul.left li:hover > a {/*ひ孫*/
    background: #afc6e2;
  }
.content {
  width: 750px;
  height: 200px;
  background: #eee;
  margin: 0 auto;
  padding: 10px;
  text-align: left;
  box-sizing: border-box;
}