*{
    margin:0;
    padding:0;
    box-sizing:border-box;
}

body{
    display:grid;
    place-items:center;
    min-height:100vh;
    background:#111827;
    font-family:Arial, Helvetica, sans-serif;
}

.slider{
    position:relative;
    width:700px;
    height:450px;
    overflow:hidden;
    border-radius:15px;
    box-shadow:0 20px 40px rgba(0,0,0,.4);
}

.slides img{
    position:absolute;
    inset:0;
    width:100%;
    height:100%;
    object-fit:cover;

    opacity:0;
    visibility:hidden;
    transition:.5s ease;
}

.slides img.active{
    opacity:1;
    visibility:visible;
}

.btn{
    position:absolute;
    top:50%;
    transform:translateY(-50%);

    width:50px;
    height:50px;

    border:none;
    border-radius:50%;

    background:rgba(255,255,255,.25);
    backdrop-filter:blur(10px);

    color:#fff;
    font-size:1.5rem;
    cursor:pointer;

    transition:.3s;
}

.btn:hover{
    background:#fff;
    color:#111827;
}

#prev{
    left:20px;
}

#next{
    right:20px;
}