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<html><head><meta name="viewport" content="width=device-width, initial-scale=1.0"><style>* { box-sizing:border-box;}.left { background-color:#2196F3; padding:20px; float:left; width:20%; /* The width is 20%, by default */}.main { background-color:#f1f1f1; padding:20px; float:left; width:60%; /* The width is 60%, by default */}.right { background-color:#4CAF50; padding:20px; float:left; width:20%; /* The width is 20%, by default */