.header {
  height: 76px;
  width: 100%;
  text-align: center;
  background: linear-gradient(#f9f9f9, #f0f0f0);
}

.back-btn > a,
.back-btn > a:visited,
.back-btn > a:hover,
.back-btn > a:active {
  color: #50D2C2;
  font-weight: bold;
  font-size: 18px;
}

.back-btn{
  display: none;
}

.logo{
  margin-top: 18px;
  display: inline-block;
}

#logo_img {
  height: 40px;
}

@media only screen and (min-width: 820px) {
  .header {
    text-align: inherit;
    position: relative;
  }

  .logo{
    position: relative;
    display: inline;
    top: 18px;
  }

  .back-btn > a{
    font-size: 18px;
  }

  .back-btn{
    position: absolute;
    top: 28px;
    display: inline;
  }
}