.rating {
    margin-top: 5%;
    border: 1px #999 solid;
    display: flex;
    font-size:0;
    justify-content: center;
    align-items: center;
    flex-direction: row-reverse;
    background: linear-gradient(to right, #f00 , #ff0, #0f0)
}
.rating input {
    display: none
}
.rating label {
    display: flex;
    width: 100px;
    height: 100px;
    font-size: 24px;
    justify-content: center;
    align-items: center;
    background: #fff;
    color: #000;
  cursor: pointer;
}
.rating label {
    border-left: 1px #999 solid;
    transition: .3s;
}
.rating input[type='radio']:hover~label,
input[type='radio']:checked~label{
    background: none;
    color: #fff;
}