Losange css

#carre {
    height: 30px;
    width: 30px;
    background: red;
    -ms-transform: rotate(45deg); /* Internet Explorer */
    -moz-transform: rotate(45deg); /* Firefox */
    -webkit-transform: rotate(45deg); /* Safari et Chrome */
    -o-transform: rotate(45deg); /* Opera */
}

Source: lucaswillems.com

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