#main{
    margin-top: 40px;
    margin-bottom: 40px;
}
.row{
    margin-top: 20px;
    margin-bottom: 20px;
}
#main img{
    padding: 10px;
}
.navbar-dark .navbar-nav .nav-link{
    color: #ffffff;
}
.navbar-dark .navbar-nav .nav-link:hover{
    color: #000000;
}
footer p{
font-size:12px;
}

header{
background-color:#000000;
}
.navbar{
background-color:#3399ff;
}
footer{
background-color:#3399ff;
}