.login-form {
    width: 300px;
    margin: 0 auto;
    font-family: Tahoma, Geneva, sans-serif;
}
.login-form h1 {
    text-align: center;
    color: #4d4d4d;
    font-size: 24px;
    padding: 20px 0 20px 0;
}
.login-form input[type="password"],
.login-form input[type="text"] {
    width: 100%;
    padding: 15px;
    border: 1px solid #dddddd;
    margin-bottom: 15px;
    box-sizing:border-box;
}
.login-form input[type="submit"] {
    width: 100%;
    padding: 15px;
    background-color: #535b63;
    border: 0;
    box-sizing: border-box;
    cursor: pointer;
    font-weight: bold;
    color: #ffffff;
}
.button{
        width: 100%;
        padding: 15px;
        background-color: #535b63;
        border: 0;
        box-sizing: border-box;
        cursor: pointer;
        font-weight: bold;
        color: #ffffff;

}
ul.topnav {
    list-style-type: none;
    margin: 0;
    padding: 0;
    overflow: hidden;
    background-color: #333;
  }
  
  ul.topnav li {float: left;}
  
  ul.topnav li a {
    display: block;
    color: white;
    text-align: center;
    padding: 14px 16px;
    text-decoration: none;
  }
  
  ul.topnav li a:hover:not(.active) {background-color: #111;}
  
  ul.topnav li a.active {background-color: #4CAF50;}
  
  ul.topnav li.right {float: right;}
  
  @media screen and (max-width: 600px) {
    ul.topnav li.right, 
    ul.topnav li {float: none;}
  }