Slick Carousel arrows are being cutoff, after adding Font-Awesome

Question

I am working on a Carousel for my website Peruvian Connection. I needed to style the arrows. So I looked on the stackoverflow forums and found out that I can use Font-Awesome and its Unicode to change the shape and taste of the arrows(Thread here: How to style prev/next arrows button?). When changing the icons, they work perfectly in chrome. Although, they are cut off in IE and a bit buggy in other browsers.I researched this problem and found out it is due to the font-size of the arrows.

You can find a demo here: http://www.peruvianconnection.com/category/ads/lookbook.do?test=test

Tested Browsers:

Chrome - Works Perfectly
Safari - Glitching a bit
Firefox - Only works on a certain area.
IE 9,10,11 - Arrows are cut off.

Here is the code or the Slick-Theme.css

    @charset 'UTF-8';
/* Slider */
.slick-loading .slick-list
{
    background: #fff url('./ajax-loader.gif') center center no-repeat;
}

/* Icons */
@font-face
{
    font-family: 'slick';
    font-weight: normal;
    font-style: normal;

    src: url('./fonts/slick.eot');
    src: url('./fonts/slick.eot?#iefix') format('embedded-opentype'), url('./fonts/slick.woff') format('woff'), url('./fonts/slick.ttf') format('truetype'), url('./fonts/slick.svg#slick') format('svg');
}
/* Arrows */

.slick-prev:before, .slick-next:before { font-family: FontAwesome; }

.slick-prev,
.slick-next
{
    font-size: 0;
    line-height: 0;

    position: absolute;
    top: 50%;

    display: block;

    width: 20px;
    height: 20px;
    margin-top: -10px;
    padding: 0;

    cursor: pointer;

    color: transparent;
    border: none;
    outline: none;
    background: transparent;
}
.slick-prev:hover,
.slick-prev:focus,
.slick-next:hover,
.slick-next:focus
{
    color:transparent;
    outline: none;
    background: transparent;
}
.slick-prev:hover:before,
.slick-prev:focus:before,
.slick-next:hover:before,
.slick-next:focus:before
{
    opacity: 1;
}
.slick-prev.slick-disabled:before,
.slick-next.slick-disabled:before
{
    opacity: .25;
}

.slick-prev:before,
.slick-next:before
{
    font-family: FontAwesome; 
    font-size: 40px;
    line-height: 1;
    opacity: .75;
    color: brown;

    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

.slick-prev
{
    left: -25px;
}
[dir='rtl'] .slick-prev
{
    right: -25px;
    left: auto;
}
.slick-prev:before
{
    content: "\f0d9"; 
}
[dir='rtl'] .slick-prev:before
{
   content: "\f0d9";
}

.slick-next
{
    right: -25px;
}
[dir='rtl'] .slick-next
{
    right: auto;
    left: -25px;
}
.slick-next:before
{
    content: "\f0da";
}
[dir='rtl'] .slick-next:before
{
    content: content: "\f0da";
}

/* Dots */
.slick-slider
{
    margin-bottom: 30px;
}

.slick-dots
{
    position: absolute;
    bottom: -45px;

    display: block;

    width: 100%;
    padding: 0;

    list-style: none;

    text-align: center;
}
.slick-dots li
{
    position: relative;

    display: inline-block;

    width: 20px;
    height: 20px;
    margin: 0 5px;
    padding: 0;

    cursor: pointer;
}
.slick-dots li button
{
    font-size: 0;
    line-height: 0;

    display: block;

    width: 20px;
    height: 20px;
    padding: 5px;

    cursor: pointer;

    color: transparent;
    border: 0;
    outline: none;
    background: transparent;
}
.slick-dots li button:hover,
.slick-dots li button:focus
{
    outline: none;
}
.slick-dots li button:hover:before,
.slick-dots li button:focus:before
{
    opacity: 1;
}
.slick-dots li button:before
{
    font-family: 'slick';
    font-size: 6px;
    line-height: 20px;

    position: absolute;
    top: 0;
    left: 0;

    width: 20px;
    height: 20px;

    content: '•';
    text-align: center;

    opacity: .25;
    color: black;

    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}
.slick-dots li.slick-active button:before
{
    opacity: .75;
    color: black;
}

Answer 1

in you slick-theme.css remove line number 33 and 34. i.e.

width: 20px;
height: 20px;

Tested in IE.11 and I hope it should work for other browsers as well.