<ul>
  <li><span class="arrow arrow-top"></span></li>
  <li><span class="arrow arrow-right"></span></li>
  <li><span class="arrow arrow-bottom"></span></li>
  <li><span class="arrow arrow-left"></span></li>
  <li><span class="arrow arrow-top-narrow"></span></li>
  <li><span class="arrow arrow-top-wide"></span></li>
</ul>
<uL>
  <li><span class="arrow arrow-top-left"></span></li>
  <li><span class="arrow arrow-top-right"></span></li>
  <li><span class="arrow arrow-bottom-left"></span></li>
  <li><span class="arrow arrow-bottom-right"></span></li>
</ul>

ul {
  margin: 1.5em 2em 1em;
  text-align: center;
  list-style: none;
}
ul + ul {
  margin-top: -1em;
}
ul li {
  display: inline-block;
  margin: 40px;
}

/* arrow common style */
.arrow {
  display: inline-block;
  width: 15px;
  height: 15px;
  border-top: 2px solid #000;
  border-right: 2px solid #000;
}

.arrow-top {
  transform: rotate(-45deg);
}
.arrow-right {
  transform: rotate(45deg);
}
.arrow-bottom {
  transform: rotate(135deg);
}
.arrow-left {
  transform: rotate(-135deg);
}
.arrow-top-narrow {
  transform: rotate(-45deg) skew(-15deg, -15deg);
}
.arrow-top-wide {
  transform: rotate(-45deg) skew(7deg, 7deg);
}
.arrow-top-left {
  transform: rotate(-90deg) skew(-10deg, -10deg);
}
.arrow-top-right {
  transform: rotate(0) skew(-10deg, -10deg);
}
.arrow-bottom-left {
  transform: rotate(180deg) skew(-10deg, -10deg);
}
.arrow-bottom-right {
  transform: rotate(90deg) skew(-10deg, -10deg);
}