html,body {
    margin: 0;
    padding: 0;
}
.slider {
    width: 100%;
    margin: 2em auto;
    
}

.slider-wrapper {
    width: 100%;
    height: 200px;
    position: relative;
}

.slider-wraptwo {
    width: 100%;
    height: 300px;
    position: relative;
}

.slide {
    float: left;
    position: absolute;
    width: 100%;
    height: 100%;
    opacity: 0;
    transition: opacity 2s linear;
}

.slider-wrapper > .slide:first-child {
    opacity: 1;
}