.showcase * {
    margin: 0;
    padding: 0;
}
.showcase {
    height: 600px;
    width:  960px;
    margin: 0 auto;
    overflow-x: hidden;
    font-size: 0;
}
.showcase .content {
    width: 300%;
    transition: transform 0.5s;
    z-index: 1;
}
.showcase img {
    width: 33.3%;
    height: 540;
}
.showcase .switch {
    margin-top: 35px;
    text-align: center;
}
.showcase .switch a {
    display: inline-block;
    margin: 0 10px;
    border-radius: 50%;
    width: 15px;
    height: 15px;
    background-color: gray;
}
.showcase .switch a.active {
    background-color: silver;
    box-shadow: 0px 0px 5px rgb(32,32,32);
    transition: background-color .3s;
} 

.showcase_btn {
    display: inline-block;
    margin: 0 10px;
    border-radius: 50%;
    width: 15px;
    height: 15px;
}