style: 아이콘 스타일 추가

 import React, { useState } from 'react';
 import { NavLink, useHistory } from 'react-router-dom';
+import { FaSearch } from 'react-icons/fa';
 import styled from 'styled-components';
 import InputBlock from './common/Input';
 import DropDownButton from './common/DropdownButton';
@@ -123,6 +124,8 @@ const Header = () => {
           <DropDownContainer>
             <DropDownWrap>
               <DropDownButton
+                menuPosition={{ top: 40 }}
+                size={100}
                 color="blue"
                 float="left"
                 fontsize="20px"
@@ -150,6 +153,8 @@ const Header = () => {
               fontsize="15px"
               height="36px"
               title="정렬(기본)"
+              menuPosition={{ top: 29 }}
+              size="100"
               options={[
                 { id: 0, name: '정렬(기본)' },
                 { id: 1, name: '날짜빠른순' },
@@ -159,7 +164,9 @@ const Header = () => {
             />{' '}
           </SortOptionContainer>
           <SearchOptionContainer onClick={openModal}>
-            <Button color="gray">고급 검색</Button>
+            <Button color="gray" size="md" icon={<FaSearch />}>
+              고급 검색
+            </Button>
           </SearchOptionContainer>
           <Modal showModal={showModal} setShowModal={setShowModal} />
         </OptionContainer>

 import React from 'react';
 import styled from 'styled-components';
+import { AiOutlineSearch } from 'react-icons/ai';
 import { searchBoxColorMap } from '../../lib/styles/palette';
 
-const ButtonBlock = styled.button`
+const ButtonBlock = styled.div`
+  text-align: center;
+  display: table-cell;
+  vertical-align: middle;
   width: ${props => props.size};
   height: ${props => props.size};
-  background-image: url("data:image/svg+xml;charset=utf8,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='-2 -3 30 30'%3E%3Cpath d='M15.5 14h-.79l-.28-.27C15.41 12.59 16 11.11 16 9.5 16 5.91 13.09 3 9.5 3S3 5.91 3 9.5 5.91 16 9.5 16c1.61 0 3.09-.59 4.23-1.57l.27.28v.79l5 4.99L20.49 19l-4.99-5zm-6 0C7.01 14 5 11.99 5 9.5S7.01 5 9.5 5 14 7.01 14 9.5 11.99 14 9.5 14z' fill='white'/%3E%3Cpath d='M0 0h24v24H0z' fill='none'/%3E%3C/svg%3E");
   display: ${props => props.display};
   background-color: ${props => searchBoxColorMap[props.color].background};
   &:hover {
@@ -18,9 +21,17 @@ const ButtonBlock = styled.button`
   cursor: pointer;
 `;
 
+const SFaSearch = styled(AiOutlineSearch)`
+  width: 35px;
+  height: 35px;
+  margin-right: 5px;
+  margin-top: 2px;
+`;
 const SearchBox = ({ color, float, size = '1px', display = 'none' }) => {
   return (
-    <ButtonBlock color={color} float={float} size={size} display={display} />
+    <ButtonBlock color={color} float={float} size={size} display={display}>
+      <SFaSearch />
+    </ButtonBlock>
   );
 };