* {box-sizing: border-box;
}
body {
  font-family: -apple-system, "Segoe UI";
;
  font-size: 1rem;
  font-weight: 400;
  background-color: #fff;
  margin:20 30x;
}
.Header {
  /* background-image: url(vector-white-abstract_css.jpg); */
  background:  #2196f3; 
 height:80px;
  padding: 15px 10px;
  position:relative;
  width:100%;
 
}

.Header a {
  float: left;
  color:#e5eeee;
  text-align: center;
  padding: 12px;
  text-decoration: none;
  font-size: 15px; 
  line-height: 25px;
  border-radius: 4px;
}

a.logo {
  font-size: 25px;
  /*font-weight: bold;*/
  padding: 12px 13px;
}

.Header a:hover {
  color: white;
}

.Header a.active {
  background-color:white;
  color: white;
}

.Header-right {
  float: right;
}

@media screen and (max-width: 500px) {
  .Header a {
    float: none;
    display: block;
    text-align: left;
  }
  .Header-right {
    float: none;
  }
}