CSS

css style select arrow color

.select_box{
  width: 200px;
  overflow: hidden;
  border: 1px solid #000;
  position: relative;
  padding: 10px 0;
}
.select_box:after{
  width: 0; 
  height: 0; 
  border-left: 6px solid transparent;
  border-right: 6px solid transparent;
  border-top: 6px solid #f00;
  position: absolute;
  top: 40%;
  right: 5px;
  content: "";
  z-index: 98;
 }
.select_box select{
  width: 220px;
  border: 0;
  position: relative;
  z-index: 99;
  background: none;
}

change color select arrow css cf7

body {
  background: #f2f2f2;
}

.selectdiv {
  position: relative;
  /*Don't really need this just for demo styling*/
  
  float: left;
  min-width: 200px;
  margin: 50px 33%;
}

/*To remove button from IE11, thank you Matt */
select::-ms-expand {
     display: none;
}

.selectdiv:after {
  content: '<>';
  font: 17px "Consolas", monospace;
  color: #333;
  -webkit-transform: rotate(90deg);
  -moz-transform: rotate(90deg);
  -ms-transform: rotate(90deg);
  transform: rotate(90deg);
  right: 11px;
  /*Adjust for position however you want*/
  
  top: 18px;
  padding: 0 0 2px;
  border-bottom: 1px solid #999;
  /*left line */
  
  position: absolute;
  pointer-events: none;
}

.selectdiv select {
  -webkit-appearance: none;
  -moz-appearance: none;
  appearance: none;
  /* Add some styling */
  
  display: block;
  width: 100%;
  max-width: 320px;
  height: 50px;
  float: right;
  margin: 5px 0px;
  padding: 0px 24px;
  font-size: 16px;
  line-height: 1.75;
  color: #333;
  background-color: #ffffff;
  background-image: none;
  border: 1px solid #cccccc;
  -ms-word-break: normal;
  word-break: normal;
}