body {
  font-family: helvetica;
  }
  
.container{
  width: 100%;
  height: 100vh;
  display: flex;
  flex-direction:column;
  justify-content: center;
  align-items: center;
}

.container div {
  width: 350px;
}

.header{
  text-align: center;  
  margin: 0px;
  padding: 0px;

}


.nav{
  text-align: center;
  margin: 10px;
  padding: 0px;

}

.nav ul {
  list-style-type: none;
  padding: 0;
  margin: 0;
  }
  
.nav li {
  display: inline-block;
  }

.nav li:before {
  content: "[";
  }
  
.nav li:after {
  content: "]";
  }
  
.nav .last:after {
  content: "]";
  }
  
.nav li:before, .nav li:after {
  letter-spacing: 0.1em;
  }
  
.box{
  height:200px;
  margin: 0px;
  padding: 10px 20px;
  text-align: justify; 

}


.footer{
  text-align: center;  
  margin: 10px;
  padding: 0px;

}