左の矢印だけ表示されません。

<!DOCTYPE html> <html> <head> <link href="slick-theme.css" rel="stylesheet" type="text/css"> <link href="slick.css" rel="stylesheet" type="text/css"> <script src="https://cdn.jsdelivr.net/npm/jquery@3/dist/jquery.min.js"></script> <script type="text/javascript" src="slick.min.js"></script> <link rel="stylesheet" type="text/css" href="//cdn.jsdelivr.net/npm/slick-carousel@1.8.1/slick/slick.css" /> </head> <body> <ul class="slider"> <li><a href="#"><img src="img/banner/abokado.jpg" alt="image01"></a></li> <li><a href="#"><img src="img/banner/abokado.jpg" alt="image01"></a></li> <li><a href="#"><img src="img/banner/abokado.jpg" alt="image01"></a></li> <li><a href="#"><img src="img/banner/abokado.jpg" alt="image01"></a></li> </ul> <script> $('.slider').slick({ autoplay: true, autoplaySpeed: 5000, dots: true, }); </script> </body> </html> @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,
.slick-next {
font-size: 0;
line-height: 0;

position: absolute;
top: 50%;

display: block;

width: 20px;
height: 20px;
padding: 0;
-webkit-transform: translate(0, -50%);
-ms-transform: translate(0, -50%);
transform: translate(0, -50%);

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: 'slick';
font-size: 20px;
line-height: 1;

opacity: .75;
color: white;

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

.slick-prev {
left: -25px;
z-index:
}

[dir='rtl'] .slick-prev {
right: 25px;
left: auto;

}

.slick-prev:before {
content: '';
}

[dir='rtl'] .slick-prev:before {
content: '→';
}

.slick-next {
right: -25px;
}

[dir='rtl'] .slick-next {
right: auto;
left: -25px;
}

.slick-next:before {
content: '→';
}

[dir='rtl'] .slick-next:before {
content: '←';
}

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

.slick-dots {
position: absolute;
bottom: -25px;

display: block;

width: 100%;
padding: 0;
margin: 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;
}### ヘディングのテキスト
/* Slider */
.slick-slider {
position: relative;

display: block;
box-sizing: border-box;

-webkit-user-select: none;
-moz-user-select: none;
-ms-user-select: none;
user-select: none;

-webkit-touch-callout: none;
-khtml-user-select: none;
-ms-touch-action: pan-y;
touch-action: pan-y;
-webkit-tap-highlight-color: transparent;
}

.slick-list {
position: relative;

display: block;
overflow: hidden;

margin: 0;
padding: 0;
}

.slick-list:focus {
outline: none;
}

.slick-list.dragging {
cursor: pointer;
cursor: hand;
}

.slick-slider .slick-track,
.slick-slider .slick-list {
-webkit-transform: translate3d(0, 0, 0);
-moz-transform: translate3d(0, 0, 0);
-ms-transform: translate3d(0, 0, 0);
-o-transform: translate3d(0, 0, 0);
transform: translate3d(0, 0, 0);
}

.slick-track {
position: relative;
top: 0;
left: 0;

display: block;
margin-left: auto;
margin-right: auto;
}

.slick-track:before,
.slick-track:after {
display: table;

content: '';
}

.slick-track:after {
clear: both;
}

.slick-loading .slick-track {
visibility: hidden;
}

.slick-slide {
display: none;
float: left;

height: 100%;
min-height: 1px;
}

[dir='rtl'] .slick-slide {
float: right;
}

.slick-slide img {
display: block;
}

.slick-slide.slick-loading img {
display: none;
}

.slick-slide.dragging img {
pointer-events: none;
}