*{
  margin: 0;
  padding: 0;
  -webkit-box-sizing: border-box;
  -moz-box-sizing: border-box;
  -ms-box-sizing: border-box;
  -o-box-sizing: border-box;
  box-sizing: border-box;
  font-family: sans-serif;
  font-weight: 300;
}
body,html{
  height: 100%;
  background-color: #f7f7f7;
  background-position: center center;
  background-repeat: no-repeat;
  background-size: cover;
  font-family:'Open Sans';
}
nav{
  height: 70px;
  text-align: center;
  background: transparent;
  line-height: 70px;
  color: black;
  font-size: 40px;
}
.principal{
  color: black;
  padding: 20px;
  text-align: center;
  font-size: 20px;
}
.second{
  width: 100%;
  height: 100%;
  margin: 0 auto;
  color: black;
  padding: 20px;
}
.buttons{
  padding: 20px;
  text-align: center;
}
.btn{
  font-size: 18px;
  border: none;
  padding: 15px;
  width: 170px;
  outline: none;
  display: inline-block;
  -webkit-transition: all .3s ease;
  -o-transition: all .3s ease;
  transition: all .3s ease;
}
.btn:hover{
  cursor: pointer;
}
.nrm:hover{
  background: #3c3b3b;
  color: white;
}
.scs:hover{
  background: #44be75;
  color: white;
}
.err:hover{
  background: #c33c3c;
  color: white;
}
.ft:hover{
  background: none;
}
code{
  background: white;
  border-left: 4px solid #3df16a;
  padding: 2px;
}
p{
  margin: 10px auto;
}