*{margin: 0px;}
body{
    width: 100%;
    background-image: url(Imagenes/final-lepus.jpg);  
}
.imgcentro{
    display:block;
    width:30%;
    min-width: 250px;
}
.titulo{
    border-radius: 25px;
    margin: 5px auto;
}

.puerta{
    margin: 25px auto;
}
.spam{
    font-size: 20px;
    color:white;
}
.txtcentrado{
    color:red;
    text-align: center;
}
.centro{
    margin: auto;
    width: 90%;
    display: block;
    text-align: center;
      
}
.pista{
    margin-right: 20px;
    margin-top: 5px;
    margin-bottom: 20px;
    display: block;
    height: 40px;
    float: right;
    
}
.boton{
    background: none;
    border: none;
}
.ppista{
    color: aqua;
}
.historia{
    color: white;
}
.sypuer2{
    margin-top: 50px;
    margin-bottom: 50px;
    width: 45%;
}
.sypuer3{
    height: 400px;
}
.iris{
    width:80%;
    
}
/********** Responsive ***********/

@media only screen and (min-width: 100px) {
.sypuer{
    width: 45%;
}
.sypuer2{
    width: 45%;
}
.spam{
    width: 100%;
    color:white;
}
}

@media only screen and (min-width: 300px) {
.sypuer{
    margin: auto;
    width: 30%;
}

 .spam{
    width: 60%;
    color:white;
    
}
    }
@media only screen and (min-width: 500px) {
.sypuer{
    margin: auto;
    width: 20%;
}

.spam{
    width: 50%;
    color:white;
}
    }
@media only screen and (min-width: 800px) {
.sypuer{
    margin: auto;
    width: 15%;
    }

.spam{
    width: 50%;
    color:white;
}
    }
@media only screen and (min-width: 1000px) {
.sypuer{
    margin: auto;
    width: 10%;
}

.spam{
    width: 50%;
    color:white;
}
}