How to display permanent arrows on the left/right of a carousel when using the Flexslider module?
The following CSS will get you started:

.flexslider .flex-direction-nav a.flex-prev,
.flexslider .flex-direction-nav a.flex-next {
    display: block;
    opacity: 1;
}
.flexslider .flex-direction-nav a.flex-prev {
    left: 0;
}
.flexslider .flex-direction-nav a.flex-next {
    right: 0;
}


This will also help:

.flexslider .flex-direction-nav a:before {
    font-family: serif;
    content: "";
}