.multipleSelection { 
    background-color: #f8f9fa; 
} 

.selectBox { 
    position: relative; 
} 

.selectBox select { 
    width: 100%;    
} 

.overSelect { 
    position: absolute; 
    left: 0; 
    right: 0; 
    top: 0; 
    bottom: 0; 
} 

#checkBoxes { 
    display: none; 
    border: 1px #ffc107 solid; 
    position: absolute;
    background: rgb(255, 255, 255);
    z-index: 9999999;
    overflow-y: scroll;
    height: 450px;
} 

#checkBoxes label { 
    display: block; 
} 

#checkBoxes label:hover { 
    background-color: #ffc107; 
    font-weight: bold;
}