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

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

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

#slides {
    padding: 10px;
    border: 5px solid #0F0;
    background: #00F;
    position: relative;
    z-index: 1;
}

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

#frame1:checked ~ #slides .inner {
    margin-left: 0;
}

#frame2:checked ~ #slides .inner {
    margin-left: -100%;
}

#frame3:checked ~ #slides .inner {
    margin-left: -200%;
}

#frame4: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: 300px;
}

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

#slides .frame_1 {
    background: #90C;
}

#slides .frame_2 {
    background: #F90;
}

#slides .frame_3 {
    background: #606;
}

#slides .frame_4 {
    background: #C00;
}

#controls {
    margin: -180px 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;
        }

#frame1:checked ~ #controls label:nth-child(2),
#frame2:checked ~ #controls label:nth-child(3),
#frame3:checked ~ #controls label:nth-child(4),
#frame4: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;
}

#frame1:checked ~ #controls label:nth-last-child(2),
#frame2:checked ~ #controls label:nth-last-child(3),
#frame3:checked ~ #controls label:nth-last-child(4),
#frame4:checked ~ #controls label:nth-last-child(1) {
    background: url(https://image.flaticon.com/icons/svg/130/130882.svg) no-repeat;
    float: left;
    margin: 0 0 0 -50px;
    display: block;
}

#bullets {
    margin: 150px 0 0;
    text-align: center;
}

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

#frame1:checked ~ #bullets label:nth-child(1),
#frame2:checked ~ #bullets label:nth-child(2),
#frame3:checked ~ #bullets label:nth-child(3),
#frame4:checked ~ #bullets label:nth-child(4) {
    background: #444;
}

@media screen and (max-width: 900px) {

    #frame1:checked ~ #controls label:nth-child(2),
    #frame2:checked ~ #controls label:nth-child(3),
    #frame3:checked ~ #controls label:nth-child(4),
    #frame4:checked ~ #controls label:nth-child(1),
    #frame1:checked ~ #controls label:nth-last-child(2),
    #frame2:checked ~ #controls label:nth-last-child(3),
    #frame3:checked ~ #controls label:nth-last-child(4),
    #frame4:checked ~ #controls label:nth-last-child(1) {
        margin: 0;
    }

    #slides {
        max-width: calc(100% - 140px);
        margin: 0 auto;
    }
}