body{
    background-color:lightblue;
    
}

.header {
  padding: 30px;
  text-align: left;
  background-color: #004080;
  font-size: 30px;
    
}

nav {
	
	text-align: left;
	border-bottom: 6px;
}
.btn {
	
	border:1px;
	background-color:cadetblue; 
	padding: 10px 20px; 
	font-size: 15px;
    color: black;
	cursor:pointer;
	margin:10px; 
	transition:0.6s; 
	position:relative;
    
	 
	
}
.btn1,.btn2,.btn3,.btn4, .btn5,.btn6,.btn7,.btn8,.btn9,.btn10  {
	color:white; 
}
	
.btn1:hover,.btn2:hover,.btn3:hover, .btn4:hover, .btn5:hover,.btn6:hover,.btn7:hover, .btn8:hover .btn9:hover,.btn10:hover {
	
	color:black; 

	z-index: 1; /*bring the btn hidden layers to the front*/ 
}

/* .btn::before {
	content: "";
	position:absolute; 
	
	left:0;
	width:100%; /
	height:100%; 
	
	z-index:-1; 
	
	background:#87ceeb; 
	
}

/*hidden layer in each button*/
.btn1::before,.btn2::before,.btn3::before, .btn4::before .btn5::before,.btn6::before,.btn7::before, .btn8::before .btn9::before,.btn10::before {
	
     top:0;
    border-radius: 0 0 50% 50%; 
	
}

.btn a hover {
    background-color:antiquewhite
}

.btn1::before,.btn2::before,.btn3::before, .btn4::before .btn5::before,.btn6::before,.btn7::before, .btn8::before .btn9::before,.btn10::before
{ 
height: 100%;/*show the hidden layer on hover.*/

}
#studied {
      width: 50%;
    float: left;
    margin: 0px;
    padding: 0px;
    
}

#studying {
      width: 50%;
    float: left;
    margin: 0px;
    padding: 0px;
}

.shadow {
    /*creats shadow on text*/
-moz-text-shadow: 4px 4px 4px #333;
-o-text-shadow: 4px 4px 4px #333;
-webkit-text-shadow: 4px 4px 4px #333;
text-shadow: 4px 4px 4px #333;
}

#skip-links {
position:absolute;
left:-10000px;
top:auto;
width:1px;
height:1px;
overflow:hidden;
}

#skip-links a:focus{
position:static;
width:auto;
height:auto;
}