Question

1.background-position

<style>
    .box {
        width: 200px;
        height: 100px;
        background: url("./avatar.svg") no-repeat bottom right #619dc2; /*bottom right: backing out*/
        background-position: right 20px bottom 10px;
        padding: 10px;
    }
</style>

<div class="box"></div>

2.background-origin: content-box

padding: 10px;
background: url("./avatar.svg") no-repeat #619dc2 bottom right; /* or 100% 100% */
background-origin: content-box;

3.calc()

background-position: calc(100% - 20px) calc(100% - 10px);