body {
    background-color: hex D3D3D3
  }
div {
  width: auto;
  margin: auto;
    }
a {
  color: #183247;
  font-size: 16px;
  font-family: Tahoma;
  text-align: center;

}
h1 {
      color: #183247;
      font-size: 50px;
      font-family: Tahoma;
      text-align: center;
    }
h2 {
      color: #183247;
      font-size: 24px;
      font-family: Tahoma;
      text-align: center;
    }
h3 {
      color: #183247;
      font-size: 20px;
      font-family: Tahoma;
      text-align: left;
       }
h4 {
       color: #183247;
             font-size: 14px;
             font-family: Tahoma;
             text-align: left; margin: 0px
              }
h6 {
        color: #183247;
        font-size: 14px;
        font-family: Tahoma;
        text-align: center; margin: 100px
          }
p {
         color: #183247;
         font-size: 16px;
         font-family: Tahoma;
         text-align: left; margin: 0px
        }
ul {
        list-style-type: disc;
        color: #183247
        font-size: 16px;
        font-family: Tahoma;
        text-align: left;
       }
p {
         margin: 20px;
       }

h1,h2,h3 {
     color: #183247;
        }

        button {
                  background-color: hex D3D3D3;
                  border:0;
                  color: #183247;
                  padding: 2px;
                  text-align: center;
                  text-decoration: none;
                  display: inline-block;
                  font-size: 18px;
                  margin: 5px 5px;
                }

.center {
  display: block;
  margin-left: auto;
  margin-right: auto;
  width: 50%;
}
        </style>
        </head>
        </html>