How can I resolve various warnings during compilation of my React app?

I got these warnings in my react project: (The packages in the node_module folder are up-to-date.)

How can I solve these warnings?

/src/index.css (./node_modules/css-loader/dist/cjs.js??ref--5-oneOf-4-1!./node_modules/postcss-loader/src??postcss!./src/index.css) Warning

(309:5) start value has mixed support, consider using flex-start instead printWarnings @ webpackHotDevClient.js:138

./src/index.css (./node_modules/css-loader/dist/cjs.js??ref--5-oneOf-4-1!./node_modules/postcss-loader/src??postcss!./src/index.css) Warning

(457:5) Gradient has outdated direction syntax. New syntax is like to left instead of right.

./src/index.css (./node_modules/css-loader/dist/cjs.js??ref--5-oneOf-4-1!./node_modules/postcss-loader/src??postcss!./src/index.css) Warning

(477:5) Gradient has outdated direction syntax. New syntax is like to left instead of right.

./src/index.css (./node_modules/css-loader/dist/cjs.js??ref--5-oneOf-4-1!./node_modules/postcss-loader/src??postcss!./src/index.css) Warning

(497:5) Gradient has outdated direction syntax. New syntax is like to left instead of right.

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