body{ 
    background-image:url("http://kalipso.math.uoi.gr/~skontog/Ergastiria/Erg3/img_tree.png");
    background-repeat:no-repeat;
    border: solid red;
    display:block;
    margin:auto;
    height:730px;
}

h2{
   color:rgb(0,0,0);
   background-color:#FFFF00;
} 


.content{
    margin:50px;
    background-color:rgba(255,255,255,0.6);
    border:1px;
    
}

.mbody{
   margin:150px;
   font-weight:bold;
   font-size:2em;
   border: 1px solid black;
}

p{
   color:rgb(0,0,0);
   background-color:#00ffff;
}

a{
  color:rgb(0,0,0);
  background-color:#0000ff;
}