html {
  font-family: "Helvetica", sans-serif;
  font-size: 16px;
}

body {
margin: 0 auto;
line-height: 1.4;
max-width: 1350px;
}
                                                /* header */

header {
width: 100%;
background-color: white;

}

.menu {
text-align: right;

}

.logo img{
margin-left: 1.5rem;
width: 2rem;
}

.logo{
display: flex;
font-size: 1.3rem;
align-items:  center;
}

header .company{
display: flex;
align-items: center;
justify-content: space-between;
}

.desktop li {
display: inline-flex;
padding: 0rem 1rem;
margin-right: 1.5rem;
}

header .mobile{
display: none;
}

@media only screen and (max-width: 480px) {
 .logo{
 display: none;
 }
 .desktop li{
 display: none;
 }

 header .menu{
 width: 100%;
 }
 header .mobile{
  display:flex;
  justify-content: center;
 }
 .mobile li{
  display: inline-flex;
  padding: 0rem 1rem;
  margin-right: 1.5rem;
 }
}

                                              /* main content */

.main-content {
 width: 100%;
 border: 3px solid #E3E3E3;
}

.sign-in-section {
display: flex;
width: 100%;
color: #474747;
background-color: #E3E3E3;

}

.banner-content{
width: 58%;
margin: 2rem 1.5rem;
}

.reading-image{
width: 100%;
}

.header{
width: 25%;
align-self: center;
margin: 0 auto;

}

.header p{
  font-size: 1.3rem;
}

.button{
color: white;
padding: .5rem;
text-align: center;
background-color: #474747;
}

@media only screen and (max-width: 480px) {
   .sign-in-section {
   display: block;
   padding-bottom: 2rem;
   }

   .banner-content{
    margin: 0 auto;
    width: auto;
   }

   .header{
    width: auto;
    align-self: auto;
    padding: 0rem 1rem;
   }

   .header h1{
   margin: 2rem 0 ;
   }
   .header p {
   margin: 0 0 1.5rem 0;
   }
}



                                              /*info section*/

.info-section{
display: flex;
margin: 0 auto;
padding-bottom: 2rem;
}

.info-image{
width: 100%;
}

.feature{
width: 60%;
margin:2rem 1.5rem 0 1.5rem;
}

.info-section .description  {
margin-bottom: 2rem;
}

.container{
width: 40%;
margin: 0 auto;
padding-top: 1rem;
align-items: center;
border-left: 2px solid #E3E3E3;
}

.sections{
margin: 0 auto;
display: flex;
align-items: center;
border-bottom: 2px solid #E3E3E3;
}

.sections img{
width: 35%;
height: 0 auto;
padding: 1rem;``
}

@media only screen and (max-width: 480px){

  .info-section{
  padding-bottom : 0;
  }

   .feature{
   display: none ;
   }

   .container{
     align-content: center;
     width: 100% ;
     padding-top: 0;
     border-left: none;
   }

   .sections{
     display: block;
     margin: 1rem 1rem 2rem 1rem;
     border-bottom: none;
   }
   .sections img{
   width: auto;
   height: 250px;
   padding: 0;
   }

   .sections .info-images{
    width: 100%;
   }

   .sections .content{
     padding: 1rem;
   }
   .content p{
   padding-top: 0;
   }

}

/////////////////////////////////////////////////////////////////////////*start learning content*/

course-section{
display: inline-block;
}

.course-content{
margin: 0 auto;
background-color: #EDEDED;
}

.content-center{
display: flex;
padding: 2rem ;
margin: 0 auto;
justify-content: center;
}

.courses{
display:flex;
flex-flow: wrap;
flex-direction: row;
margin: 0 4.5rem;
justify-content: space-around;
}

.courses .section{
width: 30%;
display: block;
background-color: white;
margin-bottom: 2rem;
}
.section img {
height:  auto;
width: 100%;
}

.section  .content{
margin: 0 auto;
padding: 1rem 0 1.5rem 1rem ;
}

.content h3{
padding-bottom: .5rem;
margin: 0 auto;
}

.content p{
padding-top: .5rem;
margin: 0 auto;
}

@media only screen and (max-width: 480px){

  .course-content{
  background-color: white;
  border: 2px solid #E3E3E3;
  }
  .content-center{
  padding: 2rem 0 1rem 0 ;
  }
  .contents p{
  display: none;
  }
  .contents span{
  display: none;
  }

  .section img {
    display: none;
  }
  .courses{
  display: block;
  margin: 0 1rem 2rem 1rem;

  }
  .courses .section{
  width: auto;
  background-color: #E3E3E3;
  margin-bottom: .5rem;
  }
  .contents h3{
  padding: 1rem 0 1.5rem 1rem;
  margin: 0 auto;
  }
}

//////////////////////////////////////////////////////////////////////////////////* thesis exhibit */

.final-content{
border-bottom: 3px solid #E3E3E3;
}

.info-section {
width: 100%;
}

.video-content {
width: 60%;
margin: 0 1.5rem;
}

.video-content p{
padding-top: .5rem;
margin: 0 auto;
}
video {
width: 100%;
margin: 0 auto;
padding-bottom: 1.5rem;
}

.containers{
width: 40%;
margin: 0 auto;
align-items: center;
}

.section2 img{
width: 35%;
height: 0 auto;
padding: 1rem;
}

.section2{
margin: 0 auto;
display: flex;
align-items: center;
}

@media only screen and (max-width: 480px){
  .info-section {
  width: 100%;
  }
  .video-content {
  width: 100%;
  margin: 0;
  }
  video {
  width: 100%;
  margin: 0rem;
  padding-bottom: 1.5rem;
  }
  .video-content p{
    display: none;
  }
  .video-content span{
    display: none;
  }
  .containers{
  display: none;
}
}

/////////////////////////////////////////////////////////////////////////////////////////////* footer */

.footer-content{
padding: 1rem;
display:flex;
}

.footer-content .copyright{
flex-grow: 1;
padding-left: 1.5rem;
align-content: center;
margin: 0 auto;
}

@media only screen and (max-width: 480px){
  .footer {
  }
  .footer-content .copyright{
    display: flex;
    justify-content: center;
    padding: 1rem;
  }
    .footer-content .privacy{
      display: none;
    }
}