body {
  margin-left: 400px;
  font-family: Arial, Helvetica, sans-serif;
}

.mobiluyumlumenu {
  overflow: hidden;
  background-color: #333;  
  margin:5% 0px 20px 0px;
}

.mobiluyumlumenu a {
  float: left;
  display: block; 
  color: #f2f2f2;
  text-align: center;
  padding: 14px 16px;
  text-decoration: none;
  font-size: 17px;
}

.mobiluyumlumenu a:hover {
  background-color: #ddd;
  color: black;
}

.aktif {
  background-color: #4CAF50;
  color: white;
}

.mobiluyumlumenu .simge {
  display: none;      
 
}

@media screen and (max-width: 600px) {
  .mobiluyumlumenu a:not(:first-child) {display: none;}
  .mobiluyumlumenu a.simge {
    float: right;
    display: block;  
  
  }
}

@media screen and (max-width: 600px) {
  .mobiluyumlumenu.responsive {position: relative;}
  .mobiluyumlumenu.responsive .simge {
    position: absolute;
    right: 0;
    top: 0;   
    
  }
  .mobiluyumlumenu.responsive a {
    float: none;
    display: block;
    text-align: left;
  }
}