*, *:before, *:after {
    -moz-box-sizing: border-box;
    -webkit-box-sizing: border-box;
    box-sizing: border-box;
    border: 0px solid grey;
}
.clearfix:before {
    content: " ";
    display: table;
}

.clearfix:after { /* clearfix */
  content: "";
  display: table;
  clear: both;
}
body {
	width:80%;
	padding-left: 10%;
	background: url(../img/green-tree-python.png) no-repeat;
	background-size: cover;

}
.lesson {
	background: url(../img/spring.png) no-repeat;
	background-position: right top;	
}

.all {
	background-color: rgba(197,235,150,0.8);
}
.courtesy{
	text-align: right;
	background-color: rgba(197,235,150,1);
}