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body{ background: #000; } .box{ width: 250px; height: 250px; background: #fff; padding: 30px; position: relative; overflow: hidden; } .box:before{ position: absolute; content: ''; background: orange; width: 250px; height: 350px; /*top: -260;*/ /*right: -260;*/ border-radius: 100%; /* transition: all 0.3s cubic-bezier(0.905, 0.395, 0.120, 0.550); */ -webkit-transition: all 0.3s cubic-bezier(0.905, 0.395, 0.120, 0.550); -moz-transition: all 0.3s cubic-bezier(0.905, 0.395, 0.120, 0.550); -ms-transition: all 0.3s cubic-bezier(0.905, 0.395, 0.120, 0.550); -o-transition: all 0.3s cubic-bezier(0.905, 0.395, 0.120, 0.550); opacity: 0.5; } .box:hover:before{ width: 800px; height: 800px; opacity: 1; }