*{
box-sizing: border-box;
  
}
.menu {
  float:left;
  width:20%;
  text-align:center;
}
.menu a {
  background-color:#e5e5e5;
  padding:8px;
  margin-top:7px;
  display:block;
  width:100%;
  color:black;
}
.main {
  float:left;
  width:60%;
  padding:0 20px;
}
.right {
  background-color:#454545;
  float:left;
  width:20%;
  padding:15px;
  margin-top:7px;
  text-align:center;
  border-radius:12px;
}

.center 
{
 background-color:#454545;
 
 margin-top:7px;
 margin:auto;
 width:25%;
  border-radius:12px;
 padding:20px;
 text-align:center;
}


body{
     background: linear-gradient(to bottom, rgb(0,0, 0) 0%, rgb(128,128,128) 100%);
    height: 100%;
    margin: 0;
    direction:rtl;
    background-repeat: no-repeat;
    background-attachment: fixed;
}

.button {
    background-color: #FF6600; /* Green */
    width:80%;
    border: none;
    color: white;
    padding: 10px;
    text-align: center;
    text-decoration: none;
    display: inline-block;
    font-size: 16px;
    margin: 4px 2px;
    cursor:pointer;
    border-radius:4px;
}

.sidenav {
    height: 100%;
    width: 20%;
    
    
    top: 0;
    left: 11;
    background-color: #111;
    overflow-x: hidden;
    padding-top: 25px;
}

.sidenav a {
    padding: 6px 6px 6px 32px;
    text-decoration: none;
    font-size: 25px;
    color: #818181;
    display: block;
}

.sidenav a:hover {
    color: #f1f1f1;
}

@media only screen and (max-width:620px) {
  /* For mobile phones: */
  .menu, .main, .right, .center, .sidenav {
    width:100%;
  }
}