body {
  margin: 0;
  padding: 0;
  font-family: Microsoft YaHei UI-Regular, Microsoft YaHei UI;
}

.head {
  display: flex;
  justify-content: center;
  width: 100%;
}

.center_screen {
  width: 1200px;
  min-width: 1200px;
  margin: 0 auto;
}

.toptitle {
  width: 1200px;
  background-color: #ffffff;
  height: 115px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.toptitle_img_logo {
  position: fixed;
  top: 50%;
  transform: translateY(-50%);
  left: 0;
}


.menuitem {
  text-align: right;
  margin-left: 49px;
}

.login_btn {
  width: 72px;
  font-size: 16px;
  height: 30px;
  line-height: 30px;
  text-align: center;
  color: #fff;
  background: #3370FF;
  border-radius: 15px 15px 15px 15px;
  margin-left: 45px;
  margin-top: -4px;
}

.toptitle a {
  color: #fff;
  font-size: 16px;
  text-decoration: none;
}


.toptitle_menu {
  display: flex;
  flex-shrink: 0;
}

.menuitem a {
  width: 72px;
  height: 24px;
  line-height: 24px;
  text-decoration: none;
  font-size: 16px;
  font-weight: 400;
  color: #37393D;
}

.menuitem a:hover,
.menuitem a:focus,
.menuitem a:active {
  color: #333;
}

.menuitem a.active {
  position: relative;
  color: #3370FF;
}

.menuitem a.active::after {
  content: '';
  position: absolute;
  bottom: -10px;
  width: 100%;
  left: 0;
  height: 2px;
  background: #3370FF;
  border-radius: 1px;
}

.foot {
  float: left;
  height: 205px;
  background: #FFFFFF;
  width: 100%;
  padding: 57px 0;
  box-sizing: border-box;
}

.footitem {
  text-align: center;
  height: 91px;
  font-size: 16px;
  font-family: Microsoft YaHei UI-Regular, Microsoft YaHei UI;
  color: #595959;
  line-height: 23px;
}

.footitem a,
.footitem a:hover,
.footitem a:focus,
.footitem a:visited {
  text-decoration: none;
  color: #595959;
}

.footitem div {
  margin-bottom: 10px;
}