JSFiddle - React, Tailwind, and code Playground

HTML

<div class="parent">
    <div class="child">Pie bear claw lemon drops jelly gingerbread chocolate cake donut bonbon. Fruitcake cotton candy biscuit ice cream pastry chocolate bar. Toffee lemon drops sweet. Dessert fruitcake cake sugar plum. Danish gummies chocolate candy dragée marshmallow lemon drops pastry. Chocolate bar lollipop bear claw chocolate bar biscuit jelly-o gummi bears. Pastry chocolate bar dragée. Gummies croissant apple pie chocolate wafer oat cake liquorice chocolate cake marzipan. Ice cream jelly beans caramels jelly-o sweet roll brownie dessert lemon drops candy. Topping dragée pastry wafer gummi bears wafer powder cotton candy. Sugar plum marzipan bear claw chocolate cake dragée cotton candy biscuit. Carrot cake pudding candy tiramisu jujubes carrot cake sweet roll topping carrot cake. Carrot cake wafer pie. Topping muffin biscuit biscuit.
Jujubes jelly jujubes cotton candy. Biscuit powder marshmallow tiramisu cheesecake sugar plum apple pie sugar plum chocolate. Pie bear claw chocolate cake. Tootsie roll tiramisu lemon drops soufflé. Tiramisu bear claw chocolate cake icing muffin apple pie cupcake candy canes. Tart jujubes topping topping. Apple pie sweet pie. Brownie cake sugar plum sugar plum. Dessert macaroon jujubes tootsie roll apple pie icing gummies sugar plum chocolate. Muffin croissant macaroon chocolate cake. Liquorice pudding bonbon tiramisu tootsie roll biscuit cheesecake. Lemon drops soufflé wafer marzipan jujubes icing muffin ice cream. Chocolate macaroon cupcake pastry ice cream jelly beans jujubes carrot cake gingerbread. Dessert danish chupa chups caramels biscuit candy canes cotton candy.
Marshmallow icing halvah. Jelly-o danish gummi bears lemon drops croissant pudding. Chocolate bar candy canes chocolate cake cotton candy bear claw cake ice cream. Fruitcake tootsie roll muffin candy canes pastry lemon drops bear claw halvah. Powder tart tart cotton candy. Ice cream chupa chups liquorice liquorice icing liquorice...

CSS

.parent{
    position: fixed;
    height: 100px;
    overflow-y: scroll;
}