* {box-sizing: border-box;}

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

.header {
  overflow: hidden;
  background-color: #ffffff;
  padding: 20px 10px;
}

.header a {
  float: left;
  color: black;
  text-align: center;
  padding: 12px;
  text-decoration: none;
  font-size: 18px; 
  line-height: 25px;
  border-radius: 4px;
}

.header a.logo {
  font-size: 25px;
  font-weight: bold;
}

.header a:hover {
  background-color: #ddd;
  color: black;
}

.header a.active {
  background-color: #3cbd74;
  color: white;
}

.header a.sign {
  background-color: #008afb;
  Color: white;
}

.header-right {
  float: left;
}

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


h2 {
    color: #151414;
    font-family: arial, sans-serif;
    font-size: 60px;
    font-weight: bold;
    margin-top: 0px;
    margin-bottom: 1px;
    text-align: center;
}

h3 {
  color: #151414;
  font-family: arial, sans-serif;
  font-size: 40px;
  font-weight: bold;
  margin-top: 0px;
  margin-bottom: 1px;
  padding-left: 20px;
  padding-right: 20px;
  text-align: center;
}

.info {
  font-size: 70px;

}

.center {
  text-align: center;
  font-size: x-large;
  list-style-position: inside;
}

.center2 {
  font-size: x-large;
  padding-left: 70px;
  padding-right: 70px;
}

.center3 {
  text-align: center;
  font-size: xx-large;
}

.mission {
  background-color: #ddd;
  padding: 10px;
}

.mission ul.list {
  font-size: 40px;
  list-style-position: inside;
}