div{
background-color:deepskyblue;
    width: 200px;
    height: 200px;
    float: left;
    margin: 10px; 
    padding: 10px;
    color:aliceblue;
    text-align: center;
    line-height: 200px;
    font-size: 100px;
    
    
    /*border:solid red 2px;
    border-color: greenyellow;
    border-style: outset;
    border-width: 5px;*/
    
    border-right: dashed black 5px;
    border-left: double blue 5px ;
    border-top: solid red 5px;
    border-bottom: dotted green 5px; 
    
    border-radius: 20px 0 10px 5px;
    
    
    
    
}

header{
    background-color:skyblue;
    width: 600px ;
    height:100px;
    margin: auto;
}
header a {
    background-color: firebrick;
    width:100px;
    height: 70px;
    display:block;
    float: left;    
    margin :15px 25px; 
    text-align: center;
    line-height: 70px;
        text-decoration: none;
    
    box-shadow: 7px 7px 10px rgba(0, 0, 0, 0.73);
    text-shadow: 2px 2px 5px rgba(255, 0, 0, 0.78);
    

    -webkit-transition:all 0.4s;
    -moz-transition:all 0.4s; 
    -ms-transition:all 0.4s;
    -o-transition:all 0.4s;
    transition:all 0.4s;
    
    

}

header a:hover{
    
    background-color: #04a4f8;
    color: rgba(0, 0, 0, 0.87);
    box-shadow: 6px 6px 13px blue;
    text-shadow: 3px 3px 6px white ;

    

}
h1{
    
    text-align:center;
    margin:60px auto;
    font-family: sans-serif;
}

footer{
    background-color: black;
    color:azure;
    text-align:center;
    width:100% ;
    height: 30px;
    padding:5px ;
    margin-top:60px ;
    font-family:monospace ;
}