Как сделать появление снизу вверх?

/* Меню */
.menu a {
 float: left;
 display: block;
 padding: 10px 15px;z-index: 20000;
}

.drop-down a {
 float: left;
 min-width: 190px;
 text-decoration: none; color: white; height: 27px;
 padding-top: 3px; z-index: 20000;
}

.drop-down-menu {
 float: left;
 display: block;height: 36px;float: right;z-index: 20000;
}
.menu-title { background: url("/Bar/menu-lines.png") no-repeat 9.5px 5px; background-size: 25px; width: 25px; height: 25px; }
.menu-title:hover { background: url("/Bar/menu-lines.png") no-repeat #d7b257 9.5px 5px; background-size: 25px; cursor: pointer; }

.activate {
 display: none;
 position: absolute;
 cursor: pointer;
 width: 100%;
 height: 40px;
 margin: 0 0 0 -15px;
 opacity: 0; z-index: 20000;
}

.drop-down { margin: 35px 0px 0px -145px; overflow: hidden;
 position: absolute; width: 190px;
 }
 
 .drop-down-menu:hover .drop-down {
  position: block; 
 } 


/* Skin */

.menu a, .drop-down-menu { 
}

.menu a:hover, .drop-down-menu:hover { 
}

.drop-down a {
 background: black;
}

.drop-down a:hover {
 background: #d7b257;
}

 
 .first {
 border-top-left-radius: 3px;
 border-bottom-left-radius: 3px;
 }

 .last {
 border-top-right-radius: 3px;
 border-bottom-right-radius: 3px;
 }

 .drop-down .last {
 border-radius: 0;
 border-bottom-left-radius: 3px;
 border-bottom-right-radius: 3px;
 }
 
 
/* IE */

.ie8 .drop-down-menu:hover .drop-down { display: block; } 
.ie8 .drop-down { position: absolute; }

.drop-down {
 max-height: 0;
}

.ie8 .drop-down-menu:hover .drop-down {
 max-height: 400px;
}

 
 .drop-down-menu:hover .drop-down {
 max-height: 400px;
 } 
 
 .drop-down {
  max-height: 0;
  overflow: hidden;
}

.ie8 .drop-down-menu:hover .drop-down {
    max-height: 400px;
}


@media only screen and (min-width: 800px) {

  .drop-down-menu:hover .drop-down {
    max-height: 400px;
  } 

}

@media only screen and (max-width: 799px) {

  .activate:checked ~ .drop-down {
    max-height: 400px;
  } 

}

.drop-down, .menu a, .drop-down-menu {
  -webkit-transform: translateZ(0);  
  -webkit-transition: all 0.3s;
  -moz-transition: all 0.3s;
  -o-transition: all 0.3s;
  transition: all 0.3s;
}
/* */

<nav class="drop-down-menu">
        <input type="radio" class="activate" name="accordion" />
        <div class="menu-title"></div>
        <div class="drop-down pc">
<?if($USER_LOGGED_IN$)?><a href="/index/8" class="profile2">My profile</a><?else?>
          <a href="$LOGIN_LINK$" class="signin2">Log in</a>
          <?endif?>
            <?if($USER_LOGGED_IN$)?><a href="/index/11">Settings</a><?endif?>
            <a href="/index/8-1">Contact us</a>
            <a href="/index/0-2">Rules</a>
            <a <?ifnot($USER_LOGGED_IN$)?>class="last" <?endif?>href="/faq/">FAQ</a>
            <?if($USER_LOGGED_IN$)?><a href="$ADD_ENTRY_LINK$">New post</a><?endif?>
            <?if($USER_LOGGED_IN$)?><a class="last" href="$LOGOUT_LINK$">Log out</a><?endif?>
        </div>
<style>
.drop-down.mob {<?if($USER_LOGGED_IN$)?>margin: -244px 0px 0px -145px;<?else?>margin: -155px 0px 0px -145px;<?endif?>}
</style>
        <div class="drop-down mob">
            <?if($USER_LOGGED_IN$)?><a href="$LOGOUT_LINK$">Log out</a><?endif?>
            <?if($USER_LOGGED_IN$)?><a href="$ADD_ENTRY_LINK$">New post</a><?endif?>
            <a href="/index/0-2">Rules</a>
            <?if($USER_LOGGED_IN$)?><a href="/index/11">Settings</a><?endif?>
            <a href="/faq/">FAQ</a>
            <a href="/index/8-1">Contact us</a>
<?if($USER_LOGGED_IN$)?><a href="/index/8" class="profile2">My profile</a><?else?>
          <a href="$LOGIN_LINK$" class="signin2">Log in</a>
          <?endif?>
          <div class="gpoisk">
          <div class="ya-site-form ya-site-form_inited_no" onclick="return {'action':'http://wikihsk.com/index/search/0-7','arrow':false,'bg':'transparent','fontsize':14,'fg':'#000000','language':'ru','logo':'rb','publicname':'WiKiHSK.COM','suggest':true,'target':'_blank','tld':'ru','type':3,'usebigdictionary':true,'searchid':2309877,'input_fg':'#3d3f44','input_bg':'#ffffff','input_fontStyle':'normal','input_fontWeight':'normal','input_placeholder':'Search','input_placeholderColor':'#cccccc','input_borderColor':'#ffffff'}"><form action="https://yandex.ru/search/site/" method="get" target="_blank" accept-charset="utf-8"><input type="hidden" name="searchid" value="2309877"/><input type="hidden" name="l10n" value="ru"/><input type="hidden" name="reqenc" value=""/><input type="search" name="text" value=""/><input type="submit" value="Найти"/></form></div><style type="text/css">.ya-page_js_yes .ya-site-form_inited_no { display: none; }</style>  </div>
        </div>
    </nav>