Insert Horizontal SubMenu on Prestashop website

Hello i was wondering if anyone knows who to make a horizontal menu like this

to implement on my web on prestashop http://mc-london.com/shop/en/ with its same layout.
I think i found the file on modules/blocktopmenu/css/superfish-modified.css and im pretty sure is that one to modify
but i dont know how.
Thanks

It depends on how you want the dropdowns to display, but the first thing you can do is either float or set to display: inline-block the list items in the drop down list.

If i give you the code would you help me?
/*** ESSENTIAL STYLES **/
.sf-contener {
clear: both;
margin-top:10px
}
.sf-right {
margin-right: 14px;
float: right;
width: 7px;
}
.sf-menu, .sf-menu * {
margin: 0;
padding: 0;
list-style: none;
}
.sf-menu {
padding:0;
background: none;
float:none !important;
position:relative;
margin: 0px auto !important;
width: 700px !important;
}
.sf-menu ul {
position: absolute;
top: -999em;
width: 10em; /
left offset of submenus need to match (see below) /
background: #fff !important;
background: rgba(255, 255, 255, 0.8) !important;
/margin-top:5px !important;/
}
.sf-menu ul li {
width: 100%;
}
.sf-menu li:hover {
visibility: inherit; /
fixes IE7 ‘sticky bug’ /
}
.sf-menu li {
float: left;
position: relative;
border-right: 1px solid #777;
}
.sf-menu a {
display: block;
position: relative;
color: #333;
text-transform:uppercase !important;
text-shadow:none !important;
line-height: 1em !important;
}
.sf-menu li:hover ul,
.sf-menu li.sfHover ul {
left: 0;
top: 20px; /
match top ul list item height /
z-index: 99;
width:auto
}
ul.sf-menu li:hover li ul,
ul.sf-menu li.sfHover li ul {
top: -999em;
}
ul.sf-menu li li:hover ul,
ul.sf-menu li li.sfHover ul {
left: 200px; /
match ul width /
top: 0;
}
ul.sf-menu li li:hover li ul,
ul.sf-menu li li.sfHover li ul {
top: -999em;
}
ul.sf-menu li li li:hover ul,
ul.sf-menu li li li.sfHover ul {
left: 200px; /
match ul width */
top: 0;
}

/*** DEMO SKIN /
.sf-menu {
float: left;
margin-bottom: 1em;
}
.sf-menu a {
display:block;
height:20px;
margin-right:2px;
padding: 0 10px 0 10px;
line-height:34px;
border: 0;
text-decoration:none;
}
.sf-menu a, .sf-menu a:visited { /
visited pseudo selector so IE6 applies text colour
/
color: #333;
white-space:nowrap;
}
.sf-menu li li {
/background: rgba(255, 255, 255, 0.5);/
margin-bottom: 5px;
}
.sf-menu li li li {
/background: rgba(255, 255, 255, 0.5);/
margin-bottom: 5px;
}
.sf-menu a:focus, .sf-menu a:hover, .sf-menu a:active {
background: none;
color: #9e7d3f;
}
.sf-menu ul li:hover, .sf-menu ul li.sfHover,
.sf-menu ul li a:focus, .sf-menu ul li a:hover, .sf-menu ul li a:active {
background: rgba(255, 255, 255, 0.5);
outline: 0;
}
/
** arrows /
.sf-menu a.sf-with-ul {
padding-right: 2.25em;
min-width: 1px; /
trigger IE7 hasLayout so spans position accurately /
}
.sf-sub-indicator {
position: absolute;
display: block;
right: 10px;
top: 1.05em; /
IE6 only /
width: 10px;
height: 10px;
text-indent: -999em;
overflow: hidden;
background: url(‘…/img/arrows-ffffff.png’) no-repeat -10px -100px; /
8-bit indexed alpha png. IE6 gets solid image only /
}
a > .sf-sub-indicator { /
give all except IE6 the correct values /
top: 11px;
background-position: 0 -100px; /
use translucent arrow for modern browsers
/
}
/* apply hovers to modern browsers /
a:focus > .sf-sub-indicator,
a:hover > .sf-sub-indicator,
a:active > .sf-sub-indicator,
li:hover > a > .sf-sub-indicator,
li.sfHover > a > .sf-sub-indicator {
background-position: -10px -100px; /
arrow hovers for modern browsers*/
}

/* point right for anchors in subs /
.sf-menu ul .sf-sub-indicator { background-position: -10px 0; }
.sf-menu ul a > .sf-sub-indicator { background-position: 0 0; }
/
apply hovers to modern browsers /
.sf-menu ul a:focus > .sf-sub-indicator,
.sf-menu ul a:hover > .sf-sub-indicator,
.sf-menu ul a:active > .sf-sub-indicator,
.sf-menu ul li:hover > a > .sf-sub-indicator,
.sf-menu ul li.sfHover > a > .sf-sub-indicator {
background-position: -10px 0; /
arrow hovers for modern browsers*/
}

/*** shadows for all but IE6 */
.sf-shadow ul {
/background: url(‘…/img/shadow.png’) no-repeat bottom right;/
padding: 0 8px 9px 0;
/
-moz-border-bottom-left-radius: 17px;
-moz-border-top-right-radius: 17px;
-webkit-border-top-right-radius: 17px;
-webkit-border-bottom-left-radius: 17px;
/
}
.sf-shadow ul.sf-shadow-off {
background: transparent;
}
li.sf-search {s
background: inherit;
float: right;
line-height: 25px;
}
li.sf-search input {
-moz-border-radius: 0 5px 5px 0;
padding: 3px 0;
padding-left: 20px;
margin: 6px 6px 0 0;
background: #fff url(‘…/img/search.gif’) no-repeat left center;
border:1px solid #777
}

/* hack IE7 */
.sf-menu a, .sf-menu a:visited {height:34px !IE;}
.sf-menu li li {
background:#fff !IE;
}

Thanks so much,im due paying you or someone for fixing it

The web is in prestashop i think the css is in modules/blocktopmenu/css/superfish-modifier.css anyway in firebug its shows that,i want the submenu to show
horizontal not vertical on this web
http://mc-london.com/shop/en/

I could pay you or someone to fix this and 2 more things.
It is very urgent
How much is your rate?
Thanks