Inflearn Community Q&A

 안녕하세요.
선생님의 강의를 보고 유튜브 실습을 진행했는데 search bar의 위치가 중앙이 아닌 오른쪽 다른 아이콘에 붙어있습니다.
코드를 확인했을때 이상하다고 생각하는 부분이 없었습니다...
그리고 sidebar의 글자 크기는 영상과 달라도 괜찮나요?

.header{
    height: 55px;
    display: flex;
    flex-direction: row;
    justify-content: space-between;

    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 100;

    background-color: #212121ff;
    border-bottom-width: 1px;
    border-bottom-style: solid;
    border-bottom-color: #4d4d4d;

}
.left-section{
    display: flex;
    align-items: center;
}
.hamburger-menu{
    height: 24px;
    margin-left: 24px;
    margin-right: 24px;

}
.youtube-logo{
    height: 70px;
}
.middle-section{
    flex: 1;
    margin-left: 70px;
    margin-right: 35px;
    max-width: 500px;
    display: flex;
    align-items: center;
    flex-grow: 1;
}
.search-bar{
    flex: 1;
    height: 36px;
    padding-left: 10px;
    font-size: 16px;
    border: 1px solid #4d4d4d;
    border-radius: 2px;
    background-color: #121212;
    width: 0;
}
.search-bar::placeholder{
    font-size: 16px;
}
.search-button{
    height: 40px;
    width: 66px;
    background-color: #323232;
    border: 1px solid #4d4d4d;
    margin-left: -1px;
    margin-right: 10px;
}
.search-icon{
    height: 25px;
}
.voice-search-button{
    height: 40px;
    width: 40px;
    border-radius: 20px;
    border: none;
    background-color: #121212;
}
.voice-search-icon{
    height: 24px;
}
.search-button,
.voice-search-button,
.upload-icon-container{
    display: flex;
    justify-content: center;
    align-items: center;
    position: relative;
}
.search-button .tooltip,
.voice-search-button .tooltip,
.upload-icon-container .tooltip{
    position: absolute;
    background-color: white;
    bottom: -30px;
    padding: 4px 8px 4px 8px;
    border-radius: 2px;
    font-size: 12px;
    opacity: 0;
    transition: opacity 0.15s;
    white-space: nowrap;
}
.search-button:hover .tooltip,
.voice-search-button:hover .tooltip,
.upload-icon-container:hover .tooltip{
    opacity: 1;
}
.upload-icon{
    height: 24px;
}
.youtube-apps-icon{
    height: 24px;
}
.notifications-icon{
    height: 24px;
}
.current-user-picture{
    height: 32px;
    border-radius: 16px;
}
.right-section{
    width: 180px;
    margin-right: 20px;
    display: flex;
    justify-content: space-between;
    align-items: center;
}
.notifications-icon-container{
    position: relative;
}
.notifications-count{
    position: absolute;
    top: -2px;
    right: -5px;
    background-color: rgb(200, 0, 0);
    color: white;
    font-size: 11px;
    padding-left: 5px;
    padding-right: 5px;
    padding-top: 2px;
    padding-bottom: 2px;
    border-radius: 10px;
}

<header class="header">
        <div class="left-section">
            <img class="hamburger-menu" src="assets/icons/hamburger-menu.svg" >
            <img class="youtube-logo" src="assets/icons/youtube-logo.svg">
        </div>
        <div class="middle-section">
            <input class="search-bar" type="text" placeholder="Search" >
            <button class="search-button">
                <img class="search-icon" src="assets/icons/search.svg" >
                <div class="tooltip">Search</div>
            </button>
            <button class="voice-search-button">
                <img class="voice-search-icon" src="assets/icons/voice-search-icon.svg" >
                <div class="tooltip">Search with your voice</div>
            </button>
            <div class="right-section">
                <div class="upload-icon-container">
                    <img class="upload-icon" src="assets/icons/upload.svg" >
                    <div class="tooltip">Create</div>
                </div>
                <img class="youtube-apps-icon" src="assets/icons/youtube-apps.svg" >
                <div class="notifications-icon-container">
                    <img class="notifications-icon" src="assets/icons/notifications.svg">
                    <div class="notifications-count">1</div>
                </div>
                <img class="current-user-picture" src="assets/images/avatars/avatar-1.png" >
            </div>
        </div>
    </header>