.header {
  position: fixed;
  width: 100%;
  background: #fff;
  top: 0;
  opacity: 0.95;
}

.left-text {
  float: left;
  display: inline;
  width: 134px;
  height: 35px;
}

.right-text {
  float: right;
  vertical-align: baseline;
  line-height: 45px;
}

.header-item {
  list-style: none;
  padding: 0 20px;
  margin: 0;
  display: inline-block;
}

.header-item-link {
  text-decoration: none;
  color: gray;
  font-weight: bold;
}

@media (max-width: 640px) {
  .header {
    position: inherit;
    width: auto;
    background: #fff;
    top: auto;
    opacity: 1;
    height: 10px;
  }

  .right-text,
  .left-text {
    float: none;
  }

  .header-item {
    padding: 0 10px;
  }
}

@media (max-width: 360px) {
  .header-item {
    display: block;
  }
}