*{
   margin: 0;
   padding: 0;
   box-sizing: border-box;
}
 
body{
   font-family: sans-serif;
   min-height: 100%;
   color: #555;
}
 
/* NAVIGATION RULES --------------------  */
nav{
   display: grid;
   grid-template-columns: auto 1fr;
   align-items: center;
   grid-column-gap: 30px;
   grid-template-rows: 70px;
   box-shadow: 0 5px 5px rgba(0,0,0,0.15);
   position: sticky;
   top: 0;
   background-color: white;
   padding-left: 20px;
   padding-right: 20px;
}
 
nav .brand{
   font-size: 28px;
   font-weight: 900;
   color: #245990;
}
 
nav a{
   text-decoration: none;
   display: inline-block;
   padding: 10px 35px;
   transition: background-color 0.3s, color 0.3s;
   color: #245990;
   font-size: 18px;
}
 
nav a:hover,
nav a.active{
   background: #4d9176;
   color: #fff;
   border-radius: 3px;
}
nav a:active{
   background-color: red;
}
 
/* HEADER RULES ------------------ */
header{
   padding: 40px 20px;
/*	background-color: #f4f4f4;*/
   border-bottom: thin solid #d4d4d4;
}
header h1{}
header .sub-title{
   margin-top: 20px;
   line-height: 28px;
   font-size: 20px;
}
 
/* MAIN SECTION ------------------ */
main{
   padding: 20px;
   display: grid;
   grid-template-columns: auto 1fr;
   grid-column-gap: 30px;
   margin-top: 30px;
   margin-bottom: 30px;
}
main .left{
   border-right: thin solid #d4d4d4;
   padding-right: 20px;
}
main .section-title{
   font-size: 22px;
   margin-bottom: 30px;
}
main .left a{
   display: block;
   text-decoration: none;
   color: #555;
   font-size: 18px;
   margin-bottom: 10px;
}
main .left a:hover{
   text-decoration: underline;
}
 
main .right{}
main .right .product{
   display: grid;
    grid-template-columns: auto 1fr;
   grid-column-gap: 50px;
   grid-row-gap: 50px;
}
main .right .product-left{}
main .right .product-left img{
   height: 150px;
   display: block;
   margin: 0 auto;
}
main .right .product-right{}
main .right .product-right .title{
   font-weight: bold;
   font-size: 18px;
}
main .right .product-right .title a{
   text-decoration: none;
   color: #555;
   line-height: 26px;
}
main .right .product-right .title a:hover{
   text-decoration: underline;
}
main .right .product-right .description{
   margin-top: 10px;
}
main .right .product-right .price{
   font-size: 24px;
   margin-top: 30px;
   color: darkred;
}
main .right .product-right button{
   display: block;
   border: none;
   font-size: 18px;
   padding: 10px 30px;
   margin-top: 50px;
   border: thin solid #d4d4d4;
}
 
/* FOOTER RULES  */
footer{
   background-color: #333;
   padding: 20px;
   width: 100%;
   color: white;
}