* {
    box-sizing: border-box;
}
div {
    position: relative;
    height: 250px;
    margin: 10px;
    padding: 10px;
    border-radius: 10px;
    background-color: rgb(241, 236, 230);
}
h3 {
    font-family:Arial, Helvetica, sans-serif;
    font-size: 20px;
    margin: 10px;
}
button {
    padding: 10px;
    border: none;
    border-radius: 10px;
    width: 150px; height: 150px;
    vertical-align: middle;
    color: white;
    text-align: left;
    line-height: 20px;
}
.red { background-color: #e47676; }
.blue { background-color: #579bd0; }
.green { background-color: #6fcf4f; }
.purple { background-color: #9861c5; }

._relative .blue {
    position: relative;
    top: 20px; left: 20px;
}

._absolute .blue {
    position: absolute;
    bottom: 0px; right: 0px;
}

._fixed .blue {
    position: fixed;
    bottom: 10px; right: 10px;
    z-index: 1;
}

._sticky .blue {
    position: sticky;
    bottom: 50px;
}