html {
    font-size: 3vmin;
    overflow-y: auto;
}
body{
    width:99%;
    
}
h1,h2,h3{
    text-align: center;
    text-decoration: underline;
    font-size:1.2rem;
}
img{
    height:5rem;
}
.fija{
    position:fixed;
    top:0;
    text-align:center;
    width:99%;
    height:11rem;
    background-color:white;    
    margin:auto;
    left:50%;
    transform: translate(-50%, 0);
    border-radius:1rem;
    transition:all 1s;
}
.sombra_fija {
    box-shadow: 0px 0.1rem 0.1rem 0.1rem #313030;
    background-color: rgb(203 203 201);
}
   
.texto{
    margin-top:12rem;
     font-size:1rem;
}