SOURCE

<!-- 普通按钮 -->
<button class="btn_1">普通按钮</button>

<br />

<!-- 图标按钮 -->
<button class="btn_2">图标按钮</button>

button {
  width: 120px;
  vertical-align: middle;
  line-height: 1;
  font-size: 16px;
  padding-top: 12px;
  padding-bottom: 12px;
  cursor: pointer;
  outline: none;
  border-radius: 4px;
  border: none;
  text-align: center;
}

/** 普通按钮 */
.btn_1 {
  color: #19f;
  border: 1px solid currentcolor;
  transition: color 300ms ease-in;
}

.btn_1:hover {
  color: #1b5;
}

.btn_1:active {
  color: #3322ff;
}

/** 带svg图标按钮 */
.btn_2 {
  color: #117B6F;
  font-size: 16px;
  margin-top: 30px;
  border: 1px solid currentColor;
}

.btn_2:hover, .button:focus {
  color: #01B19A;
}

.btn_2:active {
  color: #02D7BB;
}

.btn_2 svg {
  height: 16px;
  width: 16px;
  fill: #117B6F;
}

.btn_2:hover svg,
.btn_2:focus svg {
  fill: #01B19A;
}

.btn_2:active svg {
  fill: #02D7BB;
}