html{ 
    font-family: Arial, Helvetica, sans-serif;
    font-size: 20px;

}
.lista1{
    position:static;
    top:10px;
    width:100vW;
    min-height:20px;
    margin-top:2vw;
  }
    
  .lista1 ul{
    text-align: center;
    border: double;
    background-color: gray;
    width: 600px;
    border-radius: 20px;
    margin:auto;
  }
  
  .lista1 ul li{
    display:inline;
    padding-left:15px;
    padding-right: 15px;
    min-height:20px;
  }
  
  .lista1 ul li a{
    text-decoration:none;
    color:white;
    font-size: 20px;
  }
  .lista1 ul li a:hover {
    color:white;
    background-color:black;
    text-decoration: none;
  }
body{
    background-image: url(s1.jpg);
    background-repeat: repeat-Y;
    background-position: center;
    background-attachment: fixed;
    backdrop-filter: brightness(10%);
    position: absolute;
    color: white;
    margin: auto;   
    width: auto;
    height: auto;
}
h1{ 
    text-align: center;
    font-size: 60px;
}
.sec1{
    width: 90vw;
    padding: 10px;
    margin: auto;
    text-align:center;
    font-size: 20px;
    border-radius: 45px 45px 45px 45px;
    -moz-border-radius: 45px 45px 45px 45px;
    -webkit-border-radius: 45px 45px 45px 45px;
    border: 3px ridge gray;

}
p img{
    border-radius: 10%;
    padding: 10px;
}
iframe{
    padding: 10px;
}

.pie-pagina
{
  width: 100%;
  background: #333333;
  border: 1px solid #4e4d4d;
  box-shadow: inset 0 0 10px #000;
  border-radius: 3px;
}
.pie-pagina .grupo-1 
{
  width: 100%;
  max-width: 1200px;
  margin: auto;
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  grid-gap: 50px;
  padding: 45px 0px;
}
.pie-pagina .grupo-1 .box figure 
{
  width: 40%;
  height: 100%;
  display: flex;
  justify-content: center;
  align-items: center;
}
.pie-pagina .grupo-1 .box figure img
{
  width: 350px;
}
.pie-pagina .grupo-1 .box h2 
{
  color: white;
  margin-bottom: 25px;
  font-size: 20px;
}

.pie-pagina .grupo-1 .box p
{
  color: #efefef;
  margin-bottom: 10px;
}

.pie-pagina .grupo-1 .red-social a
{
  display: inline-block;
  text-decoration: none;
  width: 45px;
  height: 45px;
  line-height: 45px;
  color: white;
  margin-right: 10px;
  background-color: black;
  text-align: center;
  transition: all 300ms ease;
}
.pie-pagina .grupo-1 .red-social a:hover
{
  color: red;
}
.pie-pagina .grupo-2 
{
  background-color: grey;
  box-shadow: inset 0 0 10px #000;
  padding: 15px 10px;
  text-align: center;
  color: white;
}
.pie-pagina .grupo-2 small
{
  font-size: 15px;
}

/*------- ACTIVIDAD NUMERO 4-------*/
.img1 img
{
  filter: opacity(50%);
  border-style: dashed;
  border-color: blue;
  width: 30%;
  height: 30%;
}


/*--------- ACTIVIDAD NUMERO 6--------*/

.POSFIXIMAGEN img
{
 position: static;
 align-items: center;
 justify-content: center;
  top: 250px;
  left: 250px;
 width: 400px;

}