Submenu is hidden under slideshow in wordpress - css

Question

I have my perfect dropdown menu in wordpress by css (no plugin) but I have just a problem: Submenu is hidden under slideshow. How can I fix it? this is the css menu code:
#cssmenu ul {
list-style: none;
margin: 0;
padding: 0;
display: block;
}
#cssmenu ul:after,
#cssmenu:after {
content: ' ';
display: block;
font-size: 0;
height: 0;
clear: both;
visibility: hidden;
}
#cssmenu ul li {
margin: 0;
padding: 0;
display: block;
position: relative;
}
#cssmenu ul li a {
text-decoration: none;
display: block;
margin: 0;
-webkit-transition: color .2s ease;
-moz-transition: color .2s ease;
-ms-transition: color .2s ease;
-o-transition: color .2s ease;
transition: color .2s ease;
-webkit-box-sizing: border-box;
-moz-box-sizing: border-box;
box-sizing: border-box;
}
#cssmenu ul li ul {
position: absolute;
left: -9999px;
top: auto;
}
#cssmenu ul li ul li {
max-height: 0;
position: absolute;
-webkit-transition: max-height 0.4s ease-out;
-moz-transition: max-height 0.4s ease-out;
-ms-transition: max-height 0.4s ease-out;
-o-transition: max-height 0.4s ease-out;
transition: max-height 0.4s ease-out;
background: #ffffff;
}
#cssmenu ul li ul li.has-sub:after {
display: block;
position: absolute;
content: '';
height: 10px;
width: 10px;
border-radius: 5px;
background: #000000;
z-index: 1;
top: 13px;
right: 15px;
}
#cssmenu.align-right ul li ul li.has-sub:after {
right: auto;
left: 15px;
}
#cssmenu ul li ul li.has-sub:before {
display: block;
position: absolute;
content: '';
height: 0;
width: 0;
border: 3px solid transparent;
border-left-color: #ffffff;
z-index: 2;
top: 15px;
right: 15px;
}
#cssmenu.align-right ul li ul li.has-sub:before {
right: auto;
left: 15px;
border-left-color: transparent;
border-right-color: #ffffff;
}
#cssmenu ul li ul li a {
font-size: 14px;
font-weight: 400;
text-transform: none;
color: #000000;
letter-spacing: 0;
display: block;
width: 170px;
padding: 11px 10px 11px 20px;
}
#cssmenu ul li ul li:hover > a,
#cssmenu ul li ul li.active > a {
color: #4cb6ea;
}
#cssmenu ul li ul li:hover:after,
#cssmenu ul li ul li.active:after {
background: #4cb6ea;
}
#cssmenu ul li ul li:hover > ul {
left: 100%;
top: 0;
}
#cssmenu ul li ul li:hover > ul > li {
max-height: 72px;
position: relative;
}
#cssmenu > ul > li {
float: left;
}
#cssmenu.align-center > ul > li {
float: none;
display: inline-block;
}
#cssmenu.align-center > ul {
text-align: center;
}
#cssmenu.align-center ul ul {
text-align: left;
}
#cssmenu.align-right > ul {
float: right;
}
#cssmenu.align-right > ul > li:hover > ul {
left: auto;
right: 0;
}
#cssmenu.align-right ul ul li:hover > ul {
right: 100%;
left: auto;
}
#cssmenu.align-right ul ul li a {
text-align: right;
}
#cssmenu > ul > li:after {
content: '';
display: block;
position: absolute;
width: 100%;
height: 0;
top: 0;
z-index: 0;
background: #ffffff;
-webkit-transition: height .2s;
-moz-transition: height .2s;
-ms-transition: height .2s;
-o-transition: height .2s;
transition: height .2s;
}
#cssmenu > ul > li.has-sub > a {
padding-right: 40px;
}
#cssmenu > ul > li.has-sub > a:after {
display: block;
content: '';
background: #ffffff;
height: 12px;
width: 12px;
position: absolute;
border-radius: 13px;
right: 14px;
top: 16px;
}
#cssmenu > ul > li.has-sub > a:before {
display: block;
content: '';
border: 4px solid transparent;
border-top-color: #4cb6ea;
z-index: 2;
height: 0;
width: 0;
position: absolute;
right: 16px;
top: 21px;
}
#cssmenu > ul > li > a {
color: #ffffff;
padding: 15px 20px;
font-weight: 700;
letter-spacing: 1px;
text-transform: uppercase;
font-size: 14px;
z-index: 2;
position: relative;
}
#cssmenu > ul > li:hover:after,
#cssmenu > ul > li.active:after {
height: 100%;
}
#cssmenu > ul > li:hover > a,
#cssmenu > ul > li.active > a {
color: #000000;
}
#cssmenu > ul > li:hover > a:after,
#cssmenu > ul > li.active > a:after {
background: #000000;
}
#cssmenu > ul > li:hover > a:before,
#cssmenu > ul > li.active > a:before {
border-top-color: #ffffff;
}
#cssmenu > ul > li:hover > ul {
left: 0;
}
#cssmenu > ul > li:hover > ul > li {
max-height: 72px;
position: relative;
}
#cssmenu #menu-button {
display: none;
}
#cssmenu > ul > li > a {
display: block;
}
#cssmenu > ul > li {
width: auto;
}
#cssmenu > ul > li > ul {
width: 170px;
display: block;
}
#cssmenu > ul > li > ul > li {
width: 170px;
display: block;
}
I hope someone can help me :) Thank you!

Answer 1

Find CSS property in your CSS and replace bellow
#cssmenu ul li ul li {
background: #000 none repeat scroll 0 0;
color: #fff;
max-height: 0;
position: relative;
transition: max-height 0.4s ease-out 0s;
z-index: 2147483647 !important;
}
#cssmenu ul li ul li a {
color: #fff;
display: block;
font-size: 14px;
font-weight: 400;
letter-spacing: 0;
padding: 11px 10px 11px 20px;
position: relative;
text-transform: none;
width: 170px;
}
chek the screenshot http://awesomescreenshot.com/08b60n7lf2

Answer 2

use position: absolute; and z-index: 11; for the submenu