header {
  -webkit-box-align: center;
  -ms-flex-align: center;
  align-items: center;
  -webkit-box-shadow: 0 0 5px rgba(0, 0, 0, 0.4);
  box-shadow: 0 0 5px rgba(0, 0, 0, 0.4);
  color: #fff;
  display: -webkit-box;
  display: -ms-flexbox;
  display: flex;
  width: 100%;
}

#logo {
  background-color: #EBEBEB;
  margin-bottom: 0;
  max-width: 300px;
  padding: 10px 20px;
  text-align: center;
  width: 100%;
  height: 100%;
}

#logo img {
  max-height: 40px;
}

.auth_info {
  -webkit-box-align: center;
  -ms-flex-align: center;
  align-items: center;
  display: -webkit-box;
  display: -ms-flexbox;
  display: flex;
  -webkit-box-flex: 1;
  -ms-flex-positive: 1;
  flex-grow: 1;
  -webkit-box-pack: end;
  -ms-flex-pack: end;
  justify-content: flex-end;
  padding: 10px 30px;
}

.auth_info .content {
  display: inline-block;
  margin: 10px;
  color: white;
}

.current_time {
  -webkit-box-align: center;
  -ms-flex-align: center;
  align-items: center;
  display: -webkit-box;
  display: -ms-flexbox;
  display: flex;
  -webkit-box-flex: 1;
  -ms-flex-positive: 1;
  flex-grow: 1;
  -webkit-box-pack: start;
  -ms-flex-pack: start;
  justify-content: flex-start;
  padding: 0 0 0 20px;
}

.user_info {
  -webkit-box-align: center;
  -ms-flex-align: center;
  align-items: center;
  display: -webkit-box;
  display: -ms-flexbox;
  display: flex;
  -webkit-box-flex: 1;
  -ms-flex-positive: 1;
  flex-grow: 1;
  -webkit-box-pack: end;
  -ms-flex-pack: end;
  justify-content: flex-end;
  padding: 10px 30px;
}

.user_info .user_icon {
  display: inline-block;
  width: 30px;
  height: 30px;
}

.user_info .user_name::after {
  content: '\e80e';
  font-family: "fontello";
  font-style: normal;
  margin-left: .5em;
  width: 1em;
}

.menu {
  display: flex;
}

.menu li {
  list-style: none;
}

.menu > div {
  position: relative;
  z-index: 256; /* 他タグの裏に隠れてしまう現象防止用 */
}

.menu .menu_items a {
  padding: 10px;
  color: inherit;
  display: block;
  width: 100%;
  height: 100%;
  text-align: center;
}

.menu .menu_items {
  position: absolute;
  width: 100%;
  -webkit-transition: all .2s ease;
  transition: all .2s ease;
  visibility: hidden;
  opacity: 0;
  -webkit-box-shadow: 0 5px 5px -5px rgba(0, 0, 0, 0.4);
  box-shadow: 0 5px 5px -5px rgba(0, 0, 0, 0.4);
  padding: 0;
}

.menu div:hover .menu_items {
  visibility: visible;
  opacity: 1;
}