*{
    margin: 0;
    padding: 0;
}

<!-- def. Aterisco: aplica esas propiedades a todos los elementos -->

body {
    background: #eeeeee;
    color: #000;
    font-family: "Roboto", bold;
}

.header p{
    font-size: 50px;
    text-align: center;
    padding: 20px 0;
    
}

.contenedor{
    width: 90%; 
    max-width: 1000px; 
    border: 1px solid #000; 
    font-size: 20px;
    margin: auto;
    line-height: 30px;
    text-align: center;
}

p{
    text-align: center;
    font-family: "Roboto",serif;
    font-size: 12px;
    background: rgba(146,30,30,1);
    color: white;
    padding: 3px;
}

a:link {
  color: white;
  background-color: transparent;
  text-decoration: none;
    
}