* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
    
}

body {
    font-family: 'Montserrat', arial, sans-serif;
    width: 100%;
    background-color: white;
    margin: 0;
}

main {
    max-width: 1280px;
    margin: 0 auto; 
    padding: 0; 
}

.container {
    display: flex;
    flex-direction: row; /* default */
    flex-wrap: wrap;
}

.container div {
    background-color: #f0f0f0; 
    margin: 5px; /* white gap */
}

.nav-bar {
    background-color: lightblue; 
    padding: 10px;
}

nav ul {
    display: flex;
    flex-direction: column;
    list-style-type: none; 
    align-items: center;
}

nav ul li {
    margin-bottom: 10px;
}

nav ul li a {
    display: inline-block;
    width: 100%;
    padding: 10px;
    text-align: center;
    text-decoration: none;
    color: white;
}

nav ul li.active a {
    color: #F33A6A; 
    text-decoration: overline 1px;
}

h2 {
    text-align: center;
    margin: 50px;
}

/* Extra small devices (phones, 600px and down) */
@media only screen and (max-width: 600px) {
    .col-xs-1 {
        width: 8.33%;
    }
    .col-xs-2 {
        width: 16.66%;
    }
    .col-xs-3 {
        width: 25%;
    }
    .col-xs-4 {
        width: 33.33%;
    }
    .col-xs-5 {
        width: 41.66%;
    }
    .col-xs-6 {
        width: 50%;
    }
    .col-xs-7 {
        width: 58.33%;
    }
    .col-xs-8 {
        width: 66.66%;
    }
    .col-xs-9 {
        width: 75%;
    }    
    .col-xs-10 {
        width: 83.33%;
    }    
    .col-xs-11 {
        width: 91.66%;
    }    
    .col-xs-12 {
        width: 100%;
    }
}

/* Small devices (portrait tablets and large phones, 600px and up) */
@media only screen and (min-width: 600px) {
    .col-sm-1 {
        width: 8.33%;
    }    
    .col-sm-2 {
        width: 16.66%;
    }    
    .col-sm-3 {
        width: 25%;
    }    
    .col-sm-4 {
        width: 33.33%;
    }    
    .col-sm-5 {
        width: 41.66%;
    }    
    .col-sm-6 {
        width: 50%;
    }    
    .col-sm-7 {
        width: 58.33%;
    }    
    .col-sm-8 {
        width: 66.66%;
    }    
    .col-sm-9 {
        width: 75%;
    }    
    .col-sm-10 {
        width: 83.33%;
    }    
    .col-sm-11 {
        width: 91.66%;
    }    
    .col-sm-12 {
        width: 100%;
    }
}

/* Medium devices (landscape tablets, 768px and up) */
@media only screen and (min-width: 768px) {
    nav ul {
        flex-direction: row;
    }    
        
    .col-md-1 {
        width: 8.33%;
    }    
    .col-md-2 {
        width: 16.66%;
    }    
    .col-md-3 {
        width: 25%;
    }    
    .col-md-4 {
        width: 33.33%;
    }    
    .col-md-5 {
        width: 41.66%;
    }    
    .col-md-6 {
        width: 45%;
    }    
    .col-md-7 {
        width: 58.33%;
    }    
    .col-md-8 {
        width: 66.66%;
    }    
    .col-md-9 {
        width: 75%;
    }    
    .col-md-10 {
        width: 83.33%;
    }    
    .col-md-11 {
        width: 91.66%;
    }    
    .col-md-12 {
        width: 100%;
    }
}

/* Large devices (laptops/desktops, 992px and up) */
@media only screen and (min-width: 992px) {
    .col-lg-1 {
        width: 8.33%;
    }    
    .col-lg-2 {
        width: 16.66%;
    }    
    .col-lg-3 {
        width: 25%;
    }    
    .col-lg-4 {
        width: 50%;
        height: 300px; 
    }    
    .col-lg-5 {
        width: 41.66%;
    }    
    .col-lg-6 {
        width: 49%;
    }    
    .col-lg-7 {
        width: 58.33%;
    }    
    .col-lg-8 {
        width: 66.66%;
    }    
    .col-lg-9 {
        width: 75%;
    }    
    .col-lg-10 {
        width: 83.33%;
    }    
    .col-lg-11 {
        width: 91.66%;
    }    
    .col-lg-12 {
        width: 100%;    
    }
}

/* Extra large devices (large laptops and desktops, 1200px and up) */
@media only screen and (min-width: 1200px) {
    .col-xl-1 {
        width: 8.33%;
    }    
    .col-xl-2 {
        width: 16.66%;
    }    
    .col-xl-3 {
        width: 24%;
    }    
    .col-xl-4 {
        width: 33.33%;
    }    
    .col-xl-5 {
        width: 41.66%;
    }    
    .col-xl-6 {
        width: 45%;
		
    }    
    .col-xl-7 {
        width: 58.33%;
    }
    .col-xl-8 {
        width: 66.66%;
    }    
    .col-xl-9 {
        width: 75%;
    }    
    .col-xl-10 {
        width: 83.33%;
    }    
    .col-xl-11 {
        width: 91.66%;
    }    
    .col-xl-12 {
        width: 100%;
    }
}

/* Additional Styles */
.box1 {
    height: 300px; 
}

.box2,.box3,.box4 {
    height: 140px; 
}

.box5,.box6 {
    width: 22.1%; 
    height: 150px;	
}