index.css

*{box-sizing: border-box;
font-family: 'Fira Sans', sans-serif;
}
body{
				margin: 0;
}
img{
				width: 100px;
				height: 100px;
}
h1{
				font-size:2.5rem;
				text-align: center;
}
a{
				color:   #5B92E5;
				font-size:1.2rem ;
				list-style: none;
}
    
[class*="col-"]{
       				float:left;
       				
       				padding: 10px;
       				
       }
      /**for mobile**/
  [class*="col-"]{
  				width: 100%;
  }
      
.nav{
				background-color:  #ACE1AF   ;
				padding:  1% 7%;
				text-align: center;
}
.nav h1{
				margin: 0;
				color: white;
				padding-top:10;
}

.nav-menu {
				display:flex ;
				flex-direction: column;
				text-transform: uppercase;
				
}

.nav-menu a{
				margin: 10px 0;
				padding: 7px;
				
				border-radius: 10px;
				background-color:    #D0F0C0 ;
				text-decoration: none;
				
				outline: none;
				cursor: pointer;
}

.nav-menu a:hover{
				background-color: white;
}

 .nav::after{
 				content: ' ';
 				display: table;
 				clear: both;
 }