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 .main{ width: 300px; height: 300px; background-color: red; position: relative; } .center{ width: 100px; height: 100px; background-color: skyblue; position: absolute; left: 0; right: 0; top: 0; bottom: 0; margin: auto; } 

 .main{ width: 300px; height: 300px; background-color: red; display: flex; justify-content: center; align-items: center; } .center{ width: 100px; height: 100px; background-color: greenyellow; } 

 .main{ width: 300px; height: 300px; background-color: red; position: relative; } .center{ width: 100px; height: 100px; background-color: pink; position: absolute; left: 50%; top: 50%; transform: translateX(-50%) translateY(-50%); } 

 .main{ width: 300px; height: 300px; background-color: red; position: relative; } .center{ width: 100px; height: 100px; background-color: pink; position: absolute; left: 50%; top: 50%; margin-left: -50px; margin-top: -50px; } 

 .main{ width: 300px; height: 300px; background-color: red; display: table-cell; vertical-align: middle; } .center{ width: 100px; height: 100px; background-color: #000; margin: auto; }