#slider {
    margin: 0 auto;
    width: 800px;
    max-width: 100%;
    text-align: center;
}

#slider input[type=radio] {
    display: none;
}

#slider label {
    cursor: pointer;
    text-decoration: none;
}

#slides {
    padding: 10px;
    border: 3px solid rgb(39, 39, 39);
    background: rgb(36, 36, 36);
    position: relative;
    z-index: 1;
}

#overflow {
    width: 100%;
    overflow: hidden;
}

#slide1:checked ~ #slides .inner {
    margin-left: 0;
}

#slide2:checked ~ #slides .inner {
    margin-left: -100%;
}

#slide3:checked ~ #slides .inner {
    margin-left: -200%;
}

#slide4:checked ~ #slides .inner {
    margin-left: -300%;
}

#slides .inner {
    transition: margin-left 800ms cubic-bezier(0.770, 0.000, 0.175, 1.000);
    width: 400%;
    line-height: 0;
    height: 200px;
}

#slides .slide {
    width: 25%;
    float: left;
    display: flex;
    justify-content: center;
    align-items: center;
    height: 100%;
    color: #fff;
}

#slides .slide_1 {
    background: #000;
}

#slides .slide_2 {
    background: #000;
}

#slides .slide_3 {
    background: #000;
}

#slides .slide_4 {
    background: #000;
}

#controls {
    margin: -130px 0 0 0;
    width: 100%;
    height: 50px;
    z-index: 3;
    position: relative;
}

#controls label {
    transition: opacity 0.2s ease-out;
    display: none;
    width: 50px;
    height: 50px;
    opacity: .4;
}

#controls label:hover {
    opacity: 1;
}

#slide1:checked ~ #controls label:nth-child(2),
#slide2:checked ~ #controls label:nth-child(3),
#slide3:checked ~ #controls label:nth-child(4),
#slide4:checked ~ #controls label:nth-child(1) {
    background: url(https://image.flaticon.com/icons/svg/130/130884.svg) no-repeat;
    float: right;
    margin: 0 -50px 0 0;
    display: block;
}

#slide1:checked ~ #controls label:nth-last-child(1),
#slide2:checked ~ #controls label:nth-last-child(4),
#slide3:checked ~ #controls label:nth-last-child(3),
#slide4:checked ~ #controls label:nth-last-child(2) {
    background: url(https://image.flaticon.com/icons/svg/130/130882.svg) no-repeat;
    float: left;
    margin: 0 0 0 -50px;
    display: block;
}

#bullets {
    margin: 100px 0 0;
    text-align: center;
}

#bullets label{
    display: inline-block;
    width: 10px;
    height: 10px;
    border-radius: 100%;
    background: #ccc;
    margin: 0 10px;
}

#slide1:checked ~ #bullets label:nth-child(1),
#slide2:checked ~ #bullets label:nth-child(2),
#slide3:checked ~ #bullets label:nth-child(3),
#slide4:checked ~ #bullets label:nth-child(4) {
    background: #228f13;
}

@media screen and (max-width: 900px) {
    #slide1:checked ~ #controls label:nth-child(2),
    #slide2:checked ~ #controls label:nth-child(3),
    #slide3:checked ~ #controls label:nth-child(4),
    #slide4:checked ~ #controls label:nth-child(1) {
        margin: 0;
    }

    #slide1:checked ~ #controls label:nth-last-child(2),
    #slide2:checked ~ #controls label:nth-last-child(3),
    #slide3:checked ~ #controls label:nth-last-child(4),
    #slide4:checked ~ #controls label:nth-last-child(1) {
        margin: 0;
}
}