.chosen-select-minimal-theme.form-control{
    border:0;
}
/* modifico i css della libreria choosen
   uso una classe per creare una sorta di tema
 */
.chosen-select-minimal-theme.chosen-container-single .chosen-single{
    position: relative;
    display: block;
    overflow: hidden;
    padding: 0 0 0 8px;
    height: 45px;
    border:0;
    border-bottom:1px solid #aaa;
    border-radius: 0;
    background: #ffffff!important;
    background-clip: border-box;
    background-clip: padding-box;

    box-shadow: none;
    color: #444;
    text-decoration: none;
    white-space: nowrap;
    line-height: 24px;
}
.chosen-select-minimal-theme.chosen-container-single .chosen-single div b{
    height: 20px;
    position: absolute;
    bottom: 0px;
}
.chosen-select-minimal-theme.chosen-container .chosen-drop{
    border:0;
    box-shadow: none;
    text-align:left;
}
.chosen-select-minimal-theme.chosen-container-single .chosen-single div b{
    background:#aaa!important;
    clip-path: polygon(100% 25%,100% 90%,25% 90%);
}