.header {
    position: fixed;
    background-color: white;
    top: 0;
    left: 0;
    right: 0;
    height: 60px;
    display: flex;
    flex-direction: row;
    align-items: center;
    justify-content: space-between;
    border-bottom: 1px solid lightgray;
    z-index: 100;
    box-shadow: 0px 1px 2px rgba(0, 0, 0, 0.1);
}

.left-header-section {
    width: 180px;
    display: flex;
    flex-direction: row;
    align-items: center;
    margin-right: 70px;
}

.middle-header-section {
    flex: 1;
    display: flex;
    flex-direction: row;
    align-items: center;
    max-width: 500px;
}

.right-header-section {
    width: 280px;
    display:flex;
    flex-direction: row;
    align-items: center;
    justify-content: space-between;
    margin-left: 30px;
    flex-shrink: 0;
}

.search-icon, 
.voice-search-icon, 
.upload-icon, 
.youtube-apps-icon, 
.notifications-icon, 
.hamburger-menu-icon {
    width: 25px;
    object-fit: cover;
    object-position: center;
}
 
.hamburger-menu-icon {
    padding-left: 25px;
    padding-right: 25px;
}

.youtube-logo-icon {
    width: 90px;
}

.search-bar {
    flex: 1;
    height: 38px;
    font-size: 16px;
    font-family: Roboto, Arial;
    border: 1px solid lightgray;
    width: 4px;
    box-shadow: inset 1px 2px 3px 1px rgba(0, 0, 0, 0.05);
}

.search-bar::placeholder {
    font-size: 16px;
}

.search-button {
    padding-top: 7px;
    padding-bottom: 7px;
    padding-left: 20px;
    padding-right: 20px;
    margin-left: -1px;
    background-color: rgb(247, 247, 247);
    border: 1px solid rgb(209, 209, 209);

    position: relative;
    display: flex;
    flex-direction: row;
    align-items: center;
    justify-content: center;
}

.upload {
    position: relative;
    display: flex;
    flex-direction: row;
    align-items: center;
    justify-content: center;
}

.youtube-apps {
    position: relative;
    display: flex;
    flex-direction: row;
    align-items: center;
    justify-content: center;
}

.notifications {
    position: relative;
    display: flex;
    flex-direction: row;
    align-items: center;
    justify-content: center;
}


.notifications .tooltip,
.youtube-apps .tooltip,
.upload .tooltip,
.sign-in-button .tooltip,
.voice-search-button .tooltip, 
.search-button .tooltip {
    position: absolute;
    bottom: -30px;
    color: white;
    background-color: gray;
    opacity: 0;
    transition: opacity 0.15s;
    pointer-events: none;
    white-space: nowrap;
    padding: 4px;
}

.notifications:hover .tooltip,
.youtube-apps:hover .tooltip,
.upload:hover .tooltip,
.sign-in-button:hover .tooltip,
.voice-search-button:hover .tooltip,
.search-button:hover .tooltip {
    opacity: 1;
}

.voice-search-button {
    background-color: rgb(249, 249, 249);
    padding: 10px;
    border-radius: 40px;
    border: none;
    margin-left: 10px;

    position: relative;
    display: flex;
    flex-direction: row;
    align-items: center;
    justify-content: center;
}


.sign-in-button {
    padding: 10px;
    border-radius: 2px;
    color: blue;
    background-color: white;
    border: 1px solid blue;
    font-size: 16px;
    margin-right: 20px;

    position: relative;
    display: flex;
    flex-direction: row;
    align-items: center;
    justify-content: center;
}

.notifications-icon {
    position: relative;
}
.notifications-number {
    position: absolute;
    top: -4px;
    right: -4px;
    color: white;
    font-size: 10px;
    background-color: rgb(168, 0, 0);
    padding-top: 2px;
    padding-bottom: 2px;
    padding-right: 6px;
    padding-left: 6px;
    border-radius: 30px;
}