*{
    margin: 0;
    padding: 0;
}
#div{
    width: 300px;
    height:200px ;
    background-color: blueviolet;
}
#auth{
    width: 30%;
    margin: auto;
    border: 1px solid black;
    padding: 10px;
}
#center{
    width: 70%;
    margin: auto;
    padding: 10px;
    text-align: center;
}
 ul li{
   list-style-type: none;
   
    display: inline-block;
   
   }
   nav{
       text-align: center;
   }

 nav ul li a {
    text-decoration: none;
    text-align: center;
   padding: 14px 16px;
   display: block;
   font-weight: bold;
}
nav ul li a:hover{
    background-color: lightsalmon;
    color: rgb(97, 97, 25);
}

h2{
    color: blue;
    text-align: center;
}
#main{
 display: flex;
      width: 80%;
    margin: auto;
   flex-direction: row;
   justify-content: stretch;
  
    flex-wrap: wrap;
    border: 1px solid black;

}
#main img{
    width: 70%;
}
div.zayavka{
    width: 25%;
    border: 1px solid black;
    padding: 10px;
    margin: 35px;
}
#zayavka{
    width: 30%;
    margin: auto;
    border: 1px solid black;
    padding: 10px;
}
.sub{
  
    background-color: blueviolet;
    height: 20px;
    color: chartreuse;
}
h1,h3,h2{

    text-align: center;
}
/* Выпадающий контейнер */
.dropdown {
    float: left;
    overflow: hidden;
  }
.dropdown-content {
    display: none;
    position: absolute;
}
.dropdown-menu:hover .dropdown-content {
    display: block;
  }