#hang1 {
   height: 100px;
   width: 100%;
   display: flex;
}

#hang2 {
   height: 500px;
   width: 65%;
   margin-top: 7%;
   margin-left: 90px;
}

#hang3 {
   height: 500px;
   width: 30%;
   margin-top: 7%;
   margin-left: 10px;
}
#hang4 {
   margin-top: 1200px;
   background-color: darkblue;
   height: 300px;
   width: 100%;
   display: flex;
   color: white;
}
#cot1{
   margin-left: 30px;
}
#cot2{
   width: 30%;
   margin-left: 40px;
   margin-top: 30px;
}
#cot3{
   font-size: 140%;
   width: 30%;
   margin-left: 50px;
   margin-top: 37px;
}
#luuchon {
   display: flex;
   margin-top: 30px;
}

a {
   color: darkblue;
   text-decoration: none;
   margin-left: 40px;

}

#gach {
   width: 80%;
   height: 2px;
   background-color: darkblue;
   position: relative;
   top: 50px;
   margin-left: 10%;
}

#DN1 {
   background-color: darkblue;
   color: white;
   border: none;
   padding: 8px 40px 8px 40px;
   font-size: 16px;
   border-radius: 5px;
   cursor: pointer;
}

#DN2 {
   background-color: darkgoldenrod;
   color: white;
   border: none;
   padding: 8px 40px 8px 40px;
   font-size: 16px;
   border-radius: 5px;
   cursor: pointer;
}

#DN3 {
   background-color: darkred;
   color: white;
   border: none;
   padding: 8px 40px 8px 40px;
   font-size: 16px;
   border-radius: 5px;
   cursor: pointer;
}

.nutdangnhap {
   width: 100%;
   padding: 20px;
   font-size: 16px;
   background-color: blue;
   color: white;
   border: none;
   margin-top: 80px;
   text-align: center;
   border-radius: 5px;
}

#hang2-3 {
   display: flex;
}

#banner {
   width: 90%;
   height: 450px;
   background-color: darkblue;
   padding: 30px;
   box-sizing: border-box;
   text-align: center;
   border-radius: 10px;
}

.dangnhap {
   text-align: top;
   margin-left: 60px;
   margin-top: 100px;
   width: 70%;
   height: 510px;
   border-collapse: collapse;
   float: left;
   background: white;
   padding: 20px 30px;
   box-shadow: 0 0 2px black;
   border-radius: 5px;
}


input {
   height: 20px;
   width: 90%;
   padding: 10px;
}

img {
   border-radius: 5px;
}