.buEqn:before{
	display:block;
	content:'Equation';
	text-align:left;
	background:chocolate;
	padding-left:0.5ex;
	margin-bottom:0.5ex;
}
.buEqn{
	margin-top:1ex;
	background:bisque;
	padding-bottom:0.5ex;
}
.buEqn p{
	margin:0.5ex;
}

.buThm:before{
	display:block;
	content:'Theorem';
	text-align:left;
	background:paleturquoise;
	padding-left:0.5ex;
	margin-bottom:0.5ex;
}
.buThm{
	margin-top:1ex;
	background:lightcyan;
	padding-bottom:0.5ex;
}
.buThm p{
	margin:0.5ex;
}

.buExm:before{
	display:block;
	content:' Example';
	text-align:left;
	background:peachpuff;
	padding-left:0.5ex;
	margin-bottom:0.5ex;
}
.buExm{
	background:papayawhip;
	margin-top:1ex;
	margin:0.5ex;
}

.buExm p{
	margin:0.5ex;
}


.buDef:before{
	display:block;
	content:'Definition';
	text-align:left;
	background:cadetblue;
	padding-left:0.5ex;
	margin-bottom:0.5ex;
}
.buDef{
	background:azure;
}
.buDef p{
	margin:0.5ex;
}

.buBook p{text-align:justify;}