* {
  padding: 0;
  margin: 0;
  border: 0;
  box-sizing: border-box;
  list-style: none;
  font-family: 'Open Sans',sans-serif, arial, helvetica;
}


html{
  background-color: gray;
}

body{
  width: 360px;
  min-height: 640px;
  background-color: #efefef;
  display: -webkit-box;
  display: -ms-flexbox;
  display: flex;
  -ms-flex-flow: column;
      flex-flow: column;
  -webkit-box-align: center;
      -ms-flex-align: center;
          align-items: center;
}

.formulario{
  display: -webkit-box;
  display: -ms-flexbox;
  display: flex;
  -ms-flex-flow: column;
      flex-flow: column;
  -webkit-box-pack: center;
      -ms-flex-pack: center;
          justify-content: center;
  -webkit-box-align: center;
      -ms-flex-align: center;
          align-items: center;  
}


.logo{
  margin: 5rem 0 6rem 0;
  width: 60%;
}


.boton-principal{
  background-color: orange;
  margin-top: 1rem;
  padding: 0.5rem 4rem;
  color: #efefef;
  font-weight: 600;
  border: 1px solid orange;
  border-radius: 4px;
  cursor: pointer;
}

.campo{
  background-color: #efefef;
  outline: 1px;
  border-bottom: 1px solid gray;
  width: 15rem;
  margin: 0.5rem;
}

a{
  margin-top: 1rem;
  font-size: 0.8rem;
  text-decoration: none;
  color: #424242;
  font-weight: 500;
}

.registrarte{
  padding-top: 1rem;
  text-align: center;
  width: 280px;
  margin-top: 3rem;
  border-top: 1px solid lightgray; 
}

.registrarte a{
  font-size: 0.9rem;
}

span{
  font-size: 1rem;
  font-weight: 600;
  color: #3299bb;
}

footer{
  margin: 2rem 1rem;
  padding-top: 0.5rem;
  border-top: 1px solid lightgray;
  font-size: 0.7rem;
  text-align: center;
}