* {
    margin: 0;
    padding: 0;
    list-style: none;
    text-decoration: none;
    font-family: "Arial";
    box-sizing: border-box;
}

body {
    background: #ffffff;
}

header {
    width: 100%;
    height: 60px;
    background: #000000;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 0 100px;
}

.hamburger {
    display: none;
}

.nav-bar ul {
    display: flex;
}

.nav-bar ul li a {
    display: block;
    color: #ffffff;
    padding: 10px 25px;
    border-radius: 40px;
    transition: 0.2s;
    margin: 0 5px;
}

.nav-bar ul li a:hover {
    color: #000000;
    background: #ffffff;
}

.nav-bar ul li a.active{
    color: #000000;
    background: #ffffff;

}

.container {
    display: block;
    justify-content: center;
    align-items: center;
    height: 100%;
 }
 
.content {
     display: flex;
     max-width: 100%; 
     margin: auto;
     padding: 10px;
}
 
iframe {
     width: 90%;
     align-content: center;
     height: calc(100vh - 20px);
     border: none;
}

footer {
    background-color: #000; 
    color: #fff;
    padding: 10px;
    text-align: center;
    position: fixed;
    width: 100%;
    bottom: 0;
    font-family: Arial, sans-serif;
    font-size: 1.5vh;
}

/* P1 */

.contenedor {
    max-width: 70%;
    margin: auto;
    background: #ffffff;
    padding: 2vh;
    align-items: left;
  }
  
  .contenedor p {
    text-align: justify;
    margin: 0;
}
  
  .contenedor br {
    margin: 0;
    padding: 0;
  }                    
  
  .image_container{
    display: grid;
    justify-content: center;
    text-align: center;
    margin: 0 auto;
   }
    
  .image-border {
    width: 20vh;
    height: 20vh;
    border-radius: 70%;
    overflow: hidden;
    justify-content: center;
  }
  
  .image-border img {
    width: 100%;
    height: 100%;
    object-fit: cover;
  }
  
  .contenedor ul {
    text-align: justify;
  }

  .contenedor li {
    margin-left: 1vh;
    margin-bottom: 2vh;
  }
  
.logo {
  height: 2vh;
  width: auto;
}

/* P2 */

.project {
    display: flex;
    align-items: center;
    margin-bottom: 20px;
}
  
.project img {
    max-width: 200px;
    margin-right: 20px;
    border-radius: 5px;
}
  
.project-details {
    flex-grow: 1;
}
  
.project h3 {
   margin-top: 0;
}

.underline {
    text-decoration: underline;
}

.project p {
   margin-top: 10px;
   text-indent: -2%;
   padding-left: 2%;
}

/* P3 */

.contenedor-articulos {
    max-width: 70%;
    margin: auto;
    background: white;
    padding: 10px;
  }
  
  .contenedor-articulos h2 {
    margin: 5px;
  }
  
.contenedor-articulos p {
   text-align: justify;
   margin-top: 10px;
   text-indent: -2%;
   padding-left: 2%;
   margin: 15px;
}

/* P4 */

.contenedor-teach {
    max-width: 70%;
    margin: auto;
    background: white;
    padding: 10px;
}
  
.contenedor-teach table {
  border-collapse: collapse;
  text-align: justify;
}
  
.contenedor-teach h2 {
    margin: 5px;
}
  
.contenedor-teach p {
     margin-top: 10px;
     text-indent: -2%;
     padding-left: 2%;
     margin: 15px;
     text-align: justify;
}
  
.imageS {
  height: 7vh;
  padding: 0;
  margin: 0;
}


@media only screen and (max-width: 900px){
    .hamburger {
        display: block;
        cursor: pointer;
    }

    .hamburger .line {
        width: 30px;
        height: 3px;
        background: #ffffff;
        margin: 6px 0;
    }

    .nav-bar {
        height: 0;
        position: absolute;
        top: 60px;
        left: 0;
        right: 0;
        width: 100vw;
        background: #000000;
        transition: 0.2s;
        overflow: hidden;
    }

    .nav-bar.active {
        height: 300px;
    }

    .nav-bar ul {
        display: block;
        width: auto;
        margin: 40px auto 0 auto;
        text-align: center;
        transition: 0.5s;
        opacity: 0;
    }

    .nav-bar.active ul{
        opacity: 1;
    }

    .nav-bar ul li a {
        margin-bottom: 12px;
        color: #ffffff;
    }

    .project {
        flex-direction: column;
        align-items: center;
        text-align: center;
    }

    .project img {
        margin-right: 0;
        margin-bottom: 10px;
    }

}