bz-select {
    display: block;
    margin: .5rem 0 .5rem 0;
}
bz-select > button{
    width:100%;
    text-align: left;
    font-family: sans;
    font-size: .9rem;
    border-radius: 1rem;
    border: none;
    padding: 0.2rem .2rem .3rem .5rem;
    background: linear-gradient( to bottom, #555, #aaa 15%, #ccc 50%, #aaa 85%, #555 );
}
bz-select > button::after {
    content: "\00BB";
    transform: rotate(90deg) translateX(-0.4rem);
    position: absolute;
    right: 1.5rem;
    pointer-events: none;
    font-size: 1.5rem;
    color: #444;
}    

bz-select option{
    background-color: #DDD;
    color: #000;
    padding: 0.2rem .2rem .3rem .5rem;
    margin: -1rem 0 0 0;
    border-radius: 1rem;
    height: 1rem;
    font-family: sans;
    font-size: .9rem;
    opacity: 0;
    pointer-events: none; 
    transition:
        margin-top 0.3s ease,
        opacity 0.3s ease;
}
bz-select option.open{
    margin: 2px 0 0 0;
    opacity: 1;
    pointer-events: auto;
}
bz-select option:hover{
    background-color: #44F;
    color: #FFF;
}