[selector] {
  [property]: [value];
}

/*----------------Begin----------------*/


html, body {
	height: 100%;
  z-index: 1;
  font-size: 16px;
  line-height: 1.60em;
  -webkit-font-smoothing: antialiased;
  font-smoothing: antialiased;
}

h1, h2, h3, h4, h5, h6 {
  font-weight: 400;

}

header {
 border-bottom: double;
padding-top: 40px;
padding-bottom: 10px;
width: 100%;
}



html {
  scroll-behavior: smooth;
}

*, *::before, *::after {
  margin: 0;
  padding: 0;
  border: none;
  box-sizing: border-box;
  list-style: none;
}

article, figcaption, figure, footer, header,
main, menu, nav, section, summary, p {
  display: block;
}


#inner-material {
  display: -ms-flexbox;
  display: -webkit-flex;
  display: flex;

}


/*----------------Typography----------------*/
      body{
      font-family: "Times New Roman", "Times", serif;
      font-weight: lighter;
      }

/*----------------Navigation----------------*/

    a:link, a:visited {
    color: black;
    text-decoration: underline;
    display: inline-block;
    }

    a:link.backbutton, a:active.backbutton {
    text-decoration: none;
    }
    a:link.scroll, a:active.scroll {
    text-decoration: none;
    }

    a:active { color: black; }
    a:hover { color: black;
    text-decoration: none;

    }


/*--------------Material----------------*/

#material {
      max-width: 1800px;
      margin: 5px;
}

.show-info {
  width: 0 auto;
}

.text-frag {
  margin-right: 2ch;
}

.show-title {
  padding-top: 10px;
}

body {
  background-color: white	;
  color: black;
  font-style: normal;
}

hr {
    display: block;
    unicode-bidi: isolate;
    margin-block-start: 0.5em;
    margin-block-end: 0.5em;
    margin-inline-start: auto;
    margin-inline-end: auto;
    overflow: hidden;
    border-style: inset;
    border-top-width: 1px;
    width: 100%;
}


figcaption {
  margin: 0;
  padding: 1px;
  padding-bottom: 2rem;
  font-size: 0.9rem;
}


.bottom-info {
padding-top: 10px;
width: 80%;
margin: 0 auto;
height: 10%;
padding-bottom: 1em;
display: block;
position: relative;
text-align: center;

}

.backbutton {
  text-align: left;
  padding-top: 10px;
}

.introduction {
  padding-top: 40px;
}

h1 {
    font-style: 14px "Times New Roman", "Times", serif;
    font-weight: normal;
    align-content: center;
    padding-bottom: 10px;
    margin: 0 auto;
    position: relative;
    display: block;
    padding-top: 20px;

}

h2 {
    font-style: 14px "Times New Roman", "Times", serif;
    font-weight: normal;
    margin: 0 auto;
    position: relative;
    padding-top: 40px;
    padding-bottom: 10px;
}



h5 {
    font-style: 14px "Times New Roman", "Times", serif;
    margin: 0px;
}

/*----------------side bar----------------*/
#sidebar {
  height: auto;
  width: 5%;
 border-right-style: double;
  padding-left: .5em;
  padding-right: .5em;
  text-align: center;
  font-size: 16px;
  line-height: 1.35;
  display: block;
  position: relative;
  text-align: top;

}

img {
  width: 70%;
  height: auto;
}

ul {
  padding-top: 20px;
  line-height: 1.35em;
  display: inline-block;
}

*, *::before, *::after {
      box-sizing: border-box;
}


/*---------------- Main Content----------------*/

#content {

  height: 100%;
  width: 90%;
  padding-bottom: 4em;
  display: inline-block;
  position: relative;
  text-align: center;
   border-right: double;

}

.sound-link {
  width: 100%;
  display: block;
  position: relative;
  text-decoration: underline;

}

a:active.sound-link {
  text-decoration: underline;
  color: purple;
}

.sound-link:hover {
  text-decoration: underline;
  display: inline-block;
  width: 100%;
}


#end {
  padding-top: 2px;
  padding-bottom: 2px;
}

#img-matter1 {
  padding: 5px;
  width: 50%;
  display: inline-block;
  position: relative;
}

#img-container {
  box-sizing: border-box;
  padding-top: 20px;
  margin: 10px;
  width: 25%;
  float: left;

}


.art-title {
  display: inline-block;
  float: none;
  width: 100%;
  margin: 0 auto;
  position: relative;
  padding-top: 2px;
  padding-bottom: 20px;



}

p {
  width: 60%;
  display: inline-block;
  position: relative;
  padding-top: 5px;
  padding-bottom: 10px;
  line-height: 1.60em;
}

* {
    box-sizing: border-box;
}


footer{
  border-top: double;
  text-align: center;
  margin-top: 20px;
  padding-bottom: 20px;
  position: relative;
  margin: 0px;
  padding-left: 0px;
}

/*  padding: 0 18px;
  display: none;
}



.active, .show-info {
  padding-top: 650px;
}

.onclick, .intro::after {
  padding-bottom: 0px;
}




.collapsible {
  padding-top: 650px;
  cursor: pointer;
  font-size: 15px;
}


.show-info {
  padding-top: 650px;
  cursor: pointer;
  font-size: 15px;
} */

.intro {
  font-family: "Times New Roman", "Times", serif;
  text-decoration: underline;
  cursor: pointer;
  width: 100%;
  border: none;
  outline: none;
  display: none;
}


.before, .collapsible:hover {
  color: silver;
  border: none;
  outline: none;
	z-index: 34;
  padding-bottom: 0px;
}


.collapsible:after:hover {
  display: block;
  border: none;
  outline: none;
}

.before, .show-title:after {
  padding-bottom: 0px;
  border: none;
  outline: none;
}


.collapsible {
  padding-bottom: 700px;
  background-color: transparent;
  overflow: hidden;
  font-family: "Times New Roman", "Times", serif;
  font-size: 16px;
  border: none;
  outline: none;

}


.after:hover {
  padding-bottom: 0px;
  border: none;
  outline: none;
}




/*---------------- Media styles----------------*/
@media screen and (max-width: 800px) {

#sidebar {
  padding: 0;
}

p {
  width: 90%;
}

    #sidebar, #content {
    		width: 100%;
        height: 30%;
            	}
        ul {
          display: inline;
          text-align: center;
        }

        figure {
          max-width: 70%;
          padding-left: 30px;
          margin: 0 auto;
        }

    	#sidebar {
    		position: static;
    		border: 0;
    		padding: 1em;
    	}

      #content {
        border-right:  0px solid #000;
      }

      .text-frag {
        margin-right: 1ch;
        text-align: left;
      }

    	#inner-material {
    	  display: block;
        border-right: 0px;
    	}

    	nav.menu {
    		margin-top: 0.25em;
    		margin-bottom: 0;
    	}

    	nav.menu ul li {
        margin: 0.5em;
    		margin-bottom: 0.25em;
    	}


      .intro {
        padding-top: 400px;

      }

.bio {
  display: inline-block;
  float: none;
  width: 100%;
  margin: 0 auto;
  position: relative;
  padding-top: 2px;
}


iframe {
  width: 360px;
  height: 215px;

}
    }



/*
<script>
function myFunction() {
  document.getElementById("intro").innerHTML = "Hello World";
}
</script>*/