body{text-align: center;}

header{
    height: 2080;
    width: 1700;
    background-image: url(sing\ one.jpeg);
    background-size: auto;
}

.rectangulo,header
{display: flex;
justify-content: center;
justify-items: center; 
text-align: center;
background-color: rgb(87, 87, 87);
color: white;  
font-size: 30px;
display:block;
margin: 40px;
border: 10px solid black;
border-radius: 20px;
transition-duration: 6s;
}

a
{ text-align: center;
    direction: none;
    color:white;
    background-color: gray;
    display:inline-block;
    border: 10px solid black;
    border-radius: 10px;
    
    }

.p
{font-size: 80px;
    display:inline-block;
    background-color: rgb(0, 0, 0);
    color: white;
    border: 10PX solid black;
margin: 0 auto;
border-radius: 5px;
transition-duration: 6s;
}