*{
    margin: 0;
}
body{
    border:blue 4px solid;
    height: 500vh;
    background-image: url("../img/cat.jpg");
    background-repeat: no-repeat;
    background-position: center;
    background-size: cover;
}
#wrapper{
    border:red 4px solid;
    padding: 1em;
    /*width: 800px;*/
    width: 70%;
    margin: 0 auto;
    height: 300vh;
    position: relative;
    /*background-image: url("../img/cat.jpg");*/
    background-image: linear-gradient(to bottom, red, white);
}
.box{
    border:green 4px solid;
    box-shadow: 8px 8px 8px black;
    /*border-style: dotted;*/
    /*border-width: 10px 20px 5px 2px;*/
    border-radius: 20px 0 0 20px;
    padding: 1em;
    margin: 1.5em;
    /*min-height: 100px;*/
    max-height: 100px;
    overflow: auto;
}

.box1{
    background-color: lightblue;
    /*height: 100px;*/
    /*min-height: 100px;*/
    /*margin: 10px; !*all around *!*/
    /*margin: 10px 20px; !*top-bottom and left-right *!*/
    /*margin: 10px 20px 30px; !*top then left-right and bottom *!*/
    /*margin: 10px 20px 30px 40px; !*top,right,bottom and left *!*/
    margin-left: 20px;
}
.box2{
    background-color: lightgreen;
    /*position: relative;*/
    /*position: absolute;*/
    /*position: fixed;*/
    position: sticky;

    top: 0;
    /*top: 50px;*/
    /*left: 50px;*/
    /*bottom: 50px;*/
    /*right: 50px;*/


    /*z-index: -1;*/
}
.box3{
    background-color: lightgoldenrodyellow;
}
.box4{
    background-color: lightpink;
}