* {box-sizing: border-box;}

body { 
  margin: 0;
  font-family: Arial, Helvetica, sans-serif;
}

body{background:linear-gradient(#0b0149,#0b0149, #15037d,#2f10e9);
display: block;
background-repeat: no-repeat;
background-position:center;
background-size:100%;
color:#fff;
}

.header {
  overflow: hidden;
  background-color: #f1f1f1;
  padding: 15px 10px;
  border-radius: 2vw;
  font-size: 20px;
}

.header a {
  float: left;
  color: black;
  text-align: center;
  padding: 12px;
  text-decoration: none;
  font-size: 22px;
  font-weight: bold; 
  line-height: 25px;
  border-radius: 4px;
  margin-bottom:10px;
}

.header a.active {
  background-color: dodgerblue;
  color: white;
}

.header-right {
  float: right;
  padding:4px;
  margin-top: 15px;
  font-size: 15px;
}

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

.logo{
width:100%;
border-radius:
}