.slider{
    width: 800px;
    height: 600px;
    border:1px solid;
    box-shadow: 0 0 9px rgba(0,0,0,.7);
    overflow: hidden;
    position: relative;
    margin: 0px auto;
}
.slide_next,
.slide_prev{
    position: absolute;
    width: 50px;
    height: 100%;
    padding-top: 25%;
    font-size: 70px;
    text-align: center;
    background: rgba(0,0,0,.5);
    padding-top: 25%;
    cursor: pointer;
    transition: all .5s ease-in-out;
    box-sizing: border-box;
    top: 0;
    color: #fff;
    z-index: 1;
}
.slide_next:hover,
.slide_prev:hover{
    background: rgba(0,0,0,1);
}
.slide_prev{
    left: 0;
}
.slide_next{
    right: 0;
}
.slide_container{
    position: relative;
    width: 400px;
}
img{
    width: 800px;
    height: 600px;
    float: left;
}