html_css

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.playground {
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    position: relative;
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    border: 4px solid black;
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    height: 300px;
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    padding: 20px;
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}
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.pos-box {
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    /*position: static;*/
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    /*position: absolute;*/
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    /*left top right bottom*/
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    /*!*top: 0;*!*/
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    /*!*left: 0;*!*/
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    /*bottom: 0;*/
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    /*right: 0;*/
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    position: fixed;
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    top: 0;
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    width: 50px;
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    height: 50px;
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    background: coral;
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}
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.navbar {
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    position: fixed;
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    top: 0;
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    left: 0;
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    right: 0;
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    z-index: 2;
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}
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#header {
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    margin-top: 60px;
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}