#cv-customers{
    background-color: whitesmoke;
    text-align: center;
}
#cv-customers ul{
    height: 250px;
}
#cv-customers img{
    padding: 0px 2%;
    filter: gray;
    -webkit-filter: grayscale(100%);
    -webkit-transition: all 1s; /* Safari */
    transition: all 1s;
}
#cv-customers img:hover{
    filter: inherit;
    -webkit-filter: grayscale(0%);
    background-color: rgb(255, 255, 255);
}