body{
    background-color: black;
}
 img{
    padding: 10px;
    max-height: 100%;
 }
 .your-class{
    margin: auto;
    width: 800px;

 }
.your-class div{
    height: 200px;
}

.slider-big{
    margin: auto;
    width: 800px;
}
h1{
    color: cornsilk;
    text-align: center;
}