Ppm to Ppm Calculator
.ppm-calculator { font-family: ‘Arial’, sans-serif; background-color: #f9f9f9; padding: 20px; border-radius: 8px; box-shadow: 0 2px 5px rgba(0,0,0,0.1); max-width: 600px; margin: 20px auto; } .ppm-calculator h2 { color: #333; text-align: center; margin-bottom: 25px; } .ppm-calculator h3 { color: #555; margin-top: 20px; margin-bottom:…