ionic: how to change the size of FAB icon

Go into your theme/variables.scss file and override the $fab-size variable like this:

$fab-size: 70px; //Change value to whatever size you want

If you want to change the size of the fab and still have it centered add these classes to your scss.

ion-fab-button {
   width: 100px;
   height: 100px;
}

.fab-horizontal-center {
   margin-left: unset;
   margin-inline-start: -50px !important;
}

The margin-inline-start has to be the half of the width.

Reported the bug here: https://github.com/ionic-team/ionic-framework/issues/22564

Try to use this:

<ion-fab center bottom>
  <button ion-fab mini><ion-icon name="add"></ion-icon></button>
</ion-fab>

If you use the mini attribute you can modify the size with this:

.fab[mini] {
    margin: 8px;
    width: 40px;
    height: 40px;
    line-height: 40px;
}

If you modify that class you can make the FAB button bigger or smaller.

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