.header {
    display: flex;
    justify-content: flex-start;
    align-items: center;
    width: 100vw;
    height: 5rem;
    background-color: #fff;
    background-position: top;
    box-shadow: 0 0 5px #999;
}


.header_main {
  display: flex;
  flex: 1;
  margin: 0 auto;
  max-width: 960px;
  padding: 10px 20px;
}

.header h1 {
  display: flex;
  justify-content: flex-start;
  align-items: center;
  font-size: 25px;
}

@media only screen and (max-width: 600px) {
  .header h1 {
    font-size: 18px;
  }

}

.header h1 a {
  color: #333;
  text-decoration: none;
}

.header_link {
  display: flex;
  align-items: center;
  margin-left: auto;
}

.header_link a {
  margin: 0;
  color: #333;
  text-decoration: none;
}

.header_link a::after {
  content: '|';
  margin: 0 5px;
  text-decoration: none;
  color: #ff6600;
}

.header_link a:last-child::after {
  display: none;
}