body{
    margin: 0px;
    padding: 0px;
    background-color: #DCDCDD;
    color: #fff;
    overflow: hidden;
}
#app{
    display: grid;
    grid-template-areas: "app_header"
                         "app_body"
                         "app_footer";
    grid-template-rows: auto 84vh auto;
    max-height: 100%;
}
.clear{
        clear: both;
}
.app_header{
    grid-area: app_header;
    margin: 0px;
    display: grid;
    grid-template-areas:
    "title slogan subhdr"
    "nav_left_top nav_center_top nav_right_top";
    align-items: center;
    background-color: #2b2b2b;
    padding: 4px 0px 4px;
    grid-auto-columns: auto;
}
.nav_left_top{
        grid-area: nav_left_top;
        display: flex;
        justify-content: left;
}
.nav_center_top{
        grid-area: nav_center_top;
        display: flex;
        justify-content: center;
}
.nav_right_top{
        grid-area: nav_right_top;
        display: flex;
        justify-content: right;
}
.app_hdr{
    grid-area: title;
    margin: 0px 0px 5px 0px;
    font-family: 'Gruppo', cursive;
    font-size: 36px;
    text-align: start;
    padding: 0px 0px 0px 5px;
}
.shadow{
    text-shadow: #4c5c68 -5px 3px 5px;
}
.app_subhdr{
    grid-area: subhdr;
    margin: 0px 5px;
    font-family: 'Gruppo', cursive;
    font-size: 18px;
    text-align: end;
}
.app_slogan{
        grid-area: slogan;
        margin: 0;
        font-size: 18px;
        font-family: 'Gruppo', cursive;
        text-align: center;
}
.app_body{
    display: grid;
    grid-area: app_body;
    grid-template-rows: auto;
    grid-template-areas: "shelf";
    justify-items: center;
    overflow-y: scroll;
    background-color: dimgray;
}
.app_footer{
    grid-area: app_footer;
    min-width: 100%;
    background-color: #2b2b2b;
    margin: 0px;
}
.nav_top{
    grid-area: nav_top;
    display: grid;
    grid-template-areas: "left center right";
    grid-template-columns: auto auto auto;
}
.navbar{
        list-style-type: none;
}
.left_align{
display: flex;
justify-content: left;
}
.center_align{
display: flex;
justify-content:center;
}
.right_align{
display: flex;
justify-content: right;
}
.top{

}
.inline{

}
.inline_txt{

}
.button{

}
.nav_button{
        background-color:darkgray;
        border-radius: 5px;
        border: 1px solid #999;
        min-width: 110px;
        margin: 0px 5px 0px 0px;
        padding-top: 2px;
        padding-bottom: 2px;
}
.nav_search{
        margin: 0px 5px 0px 0px;
        border-radius: 5px;
        border: 1px solid #999;
}
.search{

}
.search_details{
        display: flex;
        justify-content: center;
        margin: 0px 0px 5px 0px;
}
.shelf{
    grid-area: shelf;
    margin: 0px 0px;
    padding: 10px 0px 10px;
    list-style-type: none;
}
.shelf_contents{
}
.right_col{
    grid-area: right_col
}
.python_logo{

}
#python_logo{
    height: 50px;
    width: 91px;
}
#book_shelf{
    display: grid;
    grid-template-columns: 25% 25% 25% 25%;
    list-style-type: none;
    font-family: 'Audiowide', cursive;
    font-size: 25px;
    padding: 0;
    margin: 0px;
    min-width: 99vw;
}
.shelf_item{
    display: grid;
    background-color: burlywood;
    margin: 0 10px 10px 10px;
    max-width: 23vw;
    max-height: 75vh;
    text-align: center;
}
.book_thumb{
    width: 23vw;
    height: 75vh;
}
a.book_link{
    text-decoration: none;
}
a.nav_link{
        text-decoration: none;
        color: #fff;
}