header ul{
  text-align: center;
  list-style: none;
}

header ul li{
  float: left;
  text-align: center;
  line-height: 35px;
  margin-left: 30px;
  font-size: 14px;
  font-weight: 400;
}

header ul li a:hover{
  border-bottom: 1.5px solid gray;
}

header ul a {
  text-decoration: none;
  color: black;
}

header{
  height: 50px;
}

.section > .article1, .section > .article2{
  padding-left: 140px;
}

@media screen and (max-width:480px) {

  header ul{
    padding: 0;
    float: left;
  }

  header ul li{
    font-size: 12px;
    margin-left: 9px;
  }

  #logo{
    margin-left: 0px;
    width: 75px;
    height: auto;
  }

  .section > .article1, .section > .article2{
    padding-left: 0;
  }

}