.header{
    position: relative;
    width: 100%;
    height: 100px;
    margin: 0px;
    padding: 15px;
    display: flex;
    flex-direction: row;
}

.header-logo{
    position: relative;
    width: 100px;
    height: 100%;
}
.header > .header-view{
    display: none;
}
    .header-view > span{
        position: relative;
        font-size: 1.4em;
        color: var(--BTN_FONT_COLOR);
        float: right;
        display: none;
    }
.header > .btn-con{
    position: relative;
    width: 100%;
    height: 100%;
    padding: 15px;
    display: flex;
    flex-direction: row;
}
    .header > .btn-con > .btn{
        padding: 10px 15px 10px 15px;
        float: right;
    }
    .header > .btn-con > .menu-con{
        position: relative;
        width: auto;
        height: auto;
        display: flex;
        flex-direction: row;
        margin-left: auto;
        right: 0px;
        margin-right: 25px;
    }
        .header > .btn-con > .menu-con > .menu-item{
            position: relative;
            width: auto;
            height: auto;
            margin: auto;
            font-size: var(--BUTTON_FONT_SIZE);
            padding: 10px 35px 10px 35px;
            background-color: transparent;
            color: var(--HEADER_FONT_COLOR);
            outline: none;
            cursor: pointer;
        }
        .menu-item:after{
            position: absolute;
            content: '';
            z-index: 1;
            border-radius: 3px;
            top: 0;
            left: 0;
            bottom: 0;
            right: 0;
            opacity: 0;
            transition: opacity 0.8s;
            background: linear-gradient(180deg, transparent , var(--BTN_FONT_COLOR) 200%) no-repeat;
        }
        .menu-item:hover:after {
            opacity: 1;
        }



/* Tablet or smaller device */
@media (max-width: 600px)  { 
    .header{
        position: relative;
        width: 100%;
        height: 100%;
        flex-direction: column;
    }
    .header > .header-view{
        position: sticky;
        width: auto;
        display:block;
    }
        .header > .header-view > span.open{
            display:block;
        }
    .header > .btn-con{
        width: 100%;
        flex-direction: column;
        display: none;
    }
    .header > .btn-con > .btn{
        width: 100%;
    }
    .header > .btn-con > .menu-con{
        width: 100%;
        flex-direction: column;
    }
    .header > .btn-con > .menu-con > .menu-item{
        width: 100%;
        text-align: center;
    }
}