*{
  margin : 0em;
  padding : 0em;
}

.hidden{
  display : none;
}

.dark{
  background-color : #22222a;
  color : #ffffff; 
}

.light{
  background-color : #ffffff;
  color : #22222a;
}

body{
  transition : background-color 0s ease, color 0s ease, border-color 0s ease,opacity 0s ease;
  display : flex;
  flex-direction : column;
  justify-content : center;
  align-items : center;
  font-family :  'Roboto Condensed',Helvetica, sans-serif,Arial,'Big Shoulders';
}

.dark header, .light header{
  height: auto;
  display: flex;
  justify-content: center;
  align-items: center;
  margin-top: 3.6em;
  background-color: inherit;
}

.info_container{
  display : flex;
  flex-direction : column;
  justify-content : space-between;
  align-items : center;
  height : 5em;
}

.info_container img{
  width : 7em;
  height : auto;
}

.favicon{
  display : flex;
  justify-content : center;
  align-items : center;
}

.dark .favicon img, .light .favicon img{
  width: 6em;
  height: auto;
}

.name{
  font-size : 2.3em;
  width : auto;
  font-weight : 500;
  margin-top: 0.75em;
}

nav{
  position : fixed;
  top : 0em;
  left : 0em;
  height : 4em;
  width : 100%;
  transform : translateY(-100%);
  background-color: inherit;
  color: inherit;
  transition: box-shadow 0s ease, transform 0.25s ease;
}

.utilities{
  display : flex;
  justify-content : space-between;
  align-items: center;
  width : 100%;
  background-color: inherit;
  color: inherit;
  height: 100%;
}

.progress_bar{
  width:100%;
  transition: width 0s ease;
}

.dark .progress_bar{
  background-color: rgb(203, 223, 255);
  height:0.1em;
}

.light .progress_bar{
  background-color:rgb(6, 72, 144);
  height:0.105em;
}

.dark nav{
  box-shadow: 0 4px 8px 0 rgba(0, 0, 0, 0.2), 0 6px 20px 0 rgba(0, 0, 0, 0.19);
  border-bottom: solid #1a1a1a 0.1em;
}

.light nav{
  box-shadow: 0 4px 8px 0 rgba(0, 0, 0, 0.2), 0 6px 20px 0 rgba(0, 0, 0, 0.19);
  border-bottom:  solid #b8b8b8 0.1em;
}

.web_link{
  display : flex;
  justify-content : left;
  align-items : center;
  width : auto;
  margin-left : 0.5em;
  font-size : 1.8em;
  font-family :  Montserrat;
}

.dark .web_link #name{
  font-weight: 580;
}

.light .web_link #name{
  font-weight: 550;
}

.web_link a,.Books_Solutions p{
  cursor: pointer;
}

ul{
  list-style: none;
}

img{
  position: absolute;
}

a{
  text-decoration-line: none;
  color: inherit;
}

.sub_nav{
  display : flex;
  width : 50%;
  justify-content : space-evenly;
  align-items : center;
  font-size : 1.2em;
}


.toggle{
  display: flex;
  justify-content: center;
  align-items: center;
  transition: transform 300ms ease;
}

.toggle img{
  width : 1.1em;
  height : auto;
}

.toggle img,.favicon img{
  cursor : pointer;
}

main{
  width: 100%;
  height:35em;
}

.card_container{
  width : 100%;
  display : flex;
  flex-wrap : wrap;
  justify-content : space-evenly;
  align-items : space-around;
  height : 100%;
  color: inherit;
  background-color: inherit;
}

.card{
  display : flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  width :22em;
  border : solid 0.01em;
  height : 29.2em;
  margin-top : 0.75em;
  border-radius : 0.35em;
  transition : background-color 0.5 ease, color 0.5 ease;
  background-color: inherit;
  color: inherit;
  overflow: hidden;
  cursor: default;
  margin-right: 0.25em;
  margin-left: 0.25em;
}

.dark .card{
  background-color: #373742;
}

.light .card{
  background-color: #eeeeee;
}

.card iframe{
  width: 100%;
  height: 100%;
  border: none;
}

.cent{
  width: 100%;
}

.web_link a{
  cursor : pointer;
}

.info_container img{
  width : 7em;
  height : auto;
}

.dark li a,.dark li p,.dark .card a{
  color: rgb(203, 223, 255);
}

.light li a, .light li p,.light .card a{
  color:rgb(6, 72, 144);
}

li a:hover,li p:hover,.card a:hover{
  opacity: 0.8;
}

.dark li a:hover, .dark li p:hover,.dark .card a:hover{
   color: rgb(233, 198, 252);
}

.light li a:hover, .light li p:hover,.light .card a:hover{
  color: rgb(60, 8, 88);
}

li a:active, li p:active{
  opacity: 0.9;
}

.tooltip{
  position: absolute;
  z-index: 100;
  height: 1.75em;
  width: auto;
  pointer-events: none;
  text-align: center;
  font-size: 1em;
}

.dark .tooltip::after{
  padding: 0.25em;
  content: 'Light Mode';
  background-color: rgba(0, 0, 0, 0.45);
  color: rgba(255, 255, 255, 0.9);
}

.light .tooltip::after{
  padding: 0.25em;
  content: 'Dark Mode';
  background-color: rgba(0, 0, 0, 0.78);
  color: rgba(255, 255, 255, 0.97);
}

.card p{
  font-size: 1.2em;
}

.card a{
  font-size: 1.2em;
}

.card p, .card a{
  padding-top:0.3em;
  padding-bottom:0.3em;
}

@media (max-width:741px) {
 
  html,body{
    overflow-x : hidden;
  }

  header{
    margin-top: 3.45em;
  }

  nav{
    height :3em;
  }
  
  .web_link{
    font-size : 0.9em;
    width: 25%;
  }
  
  .sub_nav{
    font-size : 0.65em;
    width: 60%;
    margin-left: 7.5em;
    justify-content: space-evenly;
  }
  
  .toggle img{
    width :1.1em;
    height : auto;
  }
  
  .info_container{
    height:3.68em;
  }
  
  .name{
    font-size : 1.7em;
  }
  
 .dark .favicon img, .light .favicon img{
    width : 4.5em;
    height : auto;

  }
  
  main{
    width: 100%;
  }
  
  .card_container{
    width : 100%;
    height :auto;
    flex-wrap: wrap;
    align-items: center;
  }

 
  .dark .card,.light .card{
    width : 95%;
    border-radius : 0.25em;
    height:26em;
  }

  .title p{
    font-size: 0.75em;
  }

  .tooltip{
    display: none;
  }

  .light .progress_bar{
    height: 0.1em;
  }

}

@media (min-width:739px) and (max-width:799px) {
 
  html,body{
    overflow-x : hidden;
  }

  header{
    margin-top: 3.45em;
  }

  nav{
    height :3em;
  }
  
  .web_link{
    font-size : 0.9em;
    width: 25%;
  }
  
  .sub_nav{
    font-size : 0.65em;
    width: 60%;
    margin-left: 7.5em;
    justify-content: space-evenly;
  }
  
  .toggle img{
    width :1.1em;
    height : auto;
  }
  
  .info_container{
    height:3.68em;
  }
  
  .name{
    font-size : 1.7em;
  }
  
 .dark .favicon img, .light .favicon img{
    width : 4.5em;
    height : auto;

  }

}