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HTML 

              
                <input type="number" class="custom_number">
<select  class="custom_select">
  <option value="">1</option>
  <option value="">2</option>
  <option value="">3</option>
  <option value="">1234</option>
</select>
!

CSS 

              
                /* Сбрасываем стили */
* {
  margin: 0;
  outline: none;
  padding: 0;
  box-sizing: border-box;
}
*:after,*:before{
  box-sizing: border-box;
}
input, textarea {
  border: #666 1px solid;
  outline: none;
}

/* Убираем прилипание просто чтобы лучше выглядело*/
body{
  padding: 30px;
}
.custom_number{
  margin-right: 20px;
}

/* Стили для  <input type="number">*/
.custom_number.jq-number{
	display: inline-block;
	position: relative;
	font-size: 0;
}
.custom_number.jq-number .custom_number{
	font-size: 13.3333px;
	padding-right: 14px;
	width: 100%;
	height: 100%;
}
.custom_number.jq-number:hover .jq-number__spin{
	opacity: 1;
}
.custom_number.jq-number.focused .jq-number__spin{
	opacity: 1;
}
.custom_number .jq-number__field{
	display: inline-block;
	width: 100%;
	height: 100%;
}
.custom_number .jq-number__spin{
	position: absolute;
	right: 1px;
	opacity: 0;
	width: 14px;
	background: #dfdede;
	height: 8px;
	max-height: calc(50% - 1px);
	display: flex;
	align-items: center;
	justify-content: center;
}
.custom_number .jq-number__spin:hover{
	background: #b4b4b4;
}
.custom_number .jq-number__spin:active{
	background: #3f3f3f;
}
.custom_number .jq-number__spin:after{
	content: '';
	width: 6px;
	height: 4px;
	border-style: solid;
}
.custom_number .jq-number__spin.minus{
	top: 50%;
}
.custom_number .jq-number__spin.minus:after{
	border-width: 4px 3px 0 3px;
	border-color: #616161 transparent transparent transparent;
}
.custom_number .jq-number__spin.minus:hover:after{
	border-color: #000 transparent transparent transparent;
}
.custom_number .jq-number__spin.minus:active:after{
	border-color: #fff transparent transparent transparent;
}
.custom_number .jq-number__spin.plus{
	bottom: 50%;
}
.custom_number .jq-number__spin.plus:after{
	border-width: 0 3px 4px 3px;
	border-color: transparent transparent #616161 transparent;
}
.custom_number .jq-number__spin.plus:hover:after{
	border-color: transparent transparent #000 transparent;
}
.custom_number .jq-number__spin.plus:active:after{
	border-color: transparent transparent #fff transparent;
}


/* Стили для  <select>*/
.custom_select{
	display: inline-block;
	position: relative;
	padding: 0;
	background: #fff;
	font-size: 0;

}
.custom_select .jq-selectbox__select{
	display: inline-block;
	height: 100%;
	padding: 0;
}
.custom_select .jq-selectbox__select-text{
	display: inline-block;
	height: 100%;
	overflow: visible;
	font-size: 13.3333px;
	font-family: Arial;
	padding: 0;
	border: 1px solid #000;
	padding-left: 4px;
	padding-right: 14px;
}
.custom_select .jq-selectbox__trigger{
	position: absolute;
	display: flex;
	align-items: center;
	justify-content: center;
	right: 0;
	top: 0;
	height: 100%;
	width: 12px;
}
.custom_select .jq-selectbox__trigger:after{
	content: '';
	width: 6px;
	height: 4px;
	border-style: solid;
	border-width: 4px 3px 0 3px;
	border-color: #616161 transparent transparent transparent;
}
.custom_select .jq-selectbox__dropdown{
	width: 100%;
	border: 1px solid #7A9CD3;
	font-size: 13.3333px;
	font-family: Arial;
	background: #fff;
}
.custom_select.jq-selectbox li{
	padding-top: 1px;
	padding-bottom: 1px;
	padding-left: 2px;
	padding-right: 2px;
}
.custom_select.jq-selectbox li.sel{
	background: #1E90FF;
	color: #fff;
}
.custom_select.jq-selectbox ul:hover  li.sel{
	background: #fff;
	color: #000;
}
.custom_select.jq-selectbox ul:hover  li:hover{
	background: #1E90FF;
	color: #fff;
}
!

JS 

              
                $('.custom_number').styler();
$('.custom_select').styler();
!
999px

Console