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

.container
{
  width: 100%;
}

.wrapper
{
  width: 100%;
  margin: 0px;
}

.dark
{
  background-color: blue; 
  color: white;
}

body {
       background-color: cyan;
       color: rgb(0, 0, 255); 
     }


#grade{
  color:blue;
}

#web_page_heading{
  color:green;
  font-size: 24px;
}


h1 {

  font-family: arial; 
  font-size: 30px;
  color: rgb(0, 0, 255); 
  height:50px;
  background-color: magenta;
  background-color: aquamarine;
  line-height:50px;
  text-align: center; 

} 

h3 {

  font-family: arial; 
  font-size: 20px;
  color: rgb(255, 255, 255); 
  height:50px;
  background-color: green;
  line-height:50px;
  text-align: center; 

} 


ul
{
  text-align: left; 
}

ul li
{
  width: 120px;
  display: inline-block; 
  height: 35px;
  line-height: 35px; 
  text-align: center; 
}

ul li a
{
   font-family: arial; 
   font-weight: bold; 
   color: white; 
   text-decoration: none; 
   display: block; 
   text-align: center; 
}

ul li a:hover, ul li a.active
{
  background-color: orange; 
  color: black;
}

.copyright
{
  margin-top: 20px;
  margin-bottom: 20px; 
  text-align: center; 
  font-family: serif;
  background-color: navy; 
  color: white;
}

.main_body
{  
  width: 750px;  
  color: black;
  background: magenta;
  background-color: white ;
  text-align: justify;
  margin-left: 100px; 
  padding: 10px;
}




#div_text
{
  margin: 5px;
  text-align: left; 
  padding: 5px;
  margin-left: 10px;
  margin-right: 10px; 
  
}


a:hover, ul li a.active
{
  background-color: orange; 
  color: black;
}


.physics_blog .internal
{
  width: 710px; 
  border-style: solid; 
  border-color: yellow; 
  background-color: aqua; 
  display: inline-block;
  margin-top: 15px; 
  margin-left: 0px;
  text-align: left; 
  padding: 15px;
}


.physics_blog p 
{
  display:inline;
  font-family: times; 
  font-size: 20px;
  color: black; 
  text-align: left;
  padding: 2px;
  line-height: 25px; 
  font-weight: normal; 
  margin-bottom: 5px; 
}


.physics_blog h2  
{
  display: inline;
  font-family: times; 
  font-size: 20px;
  color: black; 
  text-align: left;
  padding: 2px;
  line-height: 25px; 
  font-weight: bold; 
  margin-bottom: 5px; 
}

.physics_blog a
{  
  font-family: times; 
  text-decoration: none; 
  font-style: italic;   
  color: black;
  font-weight: normal;
}



.physics_blog a:hover
{
  background-color: orange; 
  color: white;
}


.physics_blog img
{
  height: 320px;
  float: left; 
  margin-right: 20px;
}

.physics_blog table
{
  column-width: 400px; 
  margin-top: 10px; 
  margin-bottom: 10px; 
  font-size: 14px;
  color: black; 
  text-align:left;
  line-height: 20px;     
  border: 1px solid black; 
}

.physics_blog table td
{
  width: 200px;
  padding-left: 5px;
  border: 1px solid black;
}



#div_text
{
  margin: 5px;
  text-align: left; 
  padding: 5px;
  margin-left: 10px;
  margin-right: 10px; 
  
}


#div_text p 
{
  font-family: times; 
  font-size: 20px;
  text-align: left; 
  color: black;
}


#table td 
{
  font-family: times; 
  font-size: 20px;
  text-align: left; 
  color: black;
  margin-top: 10px;
}

#table th 
{
  font-family: times; 
  font-size: 17px;
  text-align: left; 
  color: black;
}

#table caption
{
  font-family: times; 
  font-size: 20px;
  text-align: center; 
  color: black;
  margin-bottom: 10px; 
}

#table tr 
{  
  padding: 100px;
}



a
{
   font-family: arial; 
   font-weight: bold; 
   color: blue; 
   text-decoration: none; 
   display: block; 
   text-align: left; 
   font-size: 16px;
   color: blue;

}

a:hover, ul li a.active
{
  background-color: orange; 
  color: black;
}  


#tips-and-quotes-of-the-day
{
  height: 60px;
  margin-bottom: 20px; 
}


#p11_1a
{
  height: 600px;
  padding: 5px; 
  margin-bottom: 20px; 
}

#p11_1b 
{
  height: 600px;
  padding: 5px; 
  margin-bottom: 20px; 
}

#p12_1 
{
  height: 50px; 
  padding: 5px; 
  margin-right: 500px; 
  margin-top: 10px;
  margin-bottom: 10px; 
}



#p12_2 
{
  height: 200px; 
  padding: 5px; 
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  margin-bottom: 10px; 
}


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{
  height: 220px; 
  padding: 5px; 
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  margin-bottom: 10px; 
}


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{
  height: 270px; 
  margin-top: 10px;
  margin-bottom: 10px; 
}


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{
  height: 300px; 
  margin-top: 15px;
  margin-bottom: 15px; 
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}


#p12_6 
{
  height: 420px; 
  margin-top: 15px;
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}


#p11_2 
{
  height: 45px; 
  padding: 5px; 
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  margin-top: 10px;
  margin-bottom: 30px; 
}



#p11_3 
{
  height: 45px; 
  padding: 5px; 
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  margin-bottom: 10px; 
}


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{
  height: 170px; 
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}


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{
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}



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{
  height: 80px; 
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}



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{
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}


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{
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}


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{
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}

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{
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{
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{
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{
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{
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{
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{
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{
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}


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{
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}


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}


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{
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}

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{
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{
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}

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{
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}

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{
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}

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{
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}

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{
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}

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{
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}

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{
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}

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{
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}

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{
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}

#p12_50
{
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}

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{
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}

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{
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}


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{
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}


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{
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}


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{
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{
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{
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{
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}


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{
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}


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{
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}


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{
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}


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{
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}


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{
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}


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{
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{
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{
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}


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{
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}


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}


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}


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}


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}


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}


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} 


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{
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} 


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} 

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} 


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{
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} 


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{
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} 


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{
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}