Can not change background color of a button in action sheet

Questions
1

I want to change background color of a button in an action sheet.
I coded background-color but it doesnt change anything, I still get white background

    transferSelection () {
var ac1 = this.$f7.actions.create({
  buttons: [
    {
      text: 'Transfer Call Via',
      bold: true,
      color: 'white',
      'background-color': 'blue'
    },
    {
      text: 'Dialer',
      color: 'blue'
    },
    {
      text: 'Contacts',
      color: 'blue'
    },
  ]
})

ac1.open();
    },

I want to get this visuality

correctUI

2

The docs say that the attribute is bg instead of background-color.

...
color: 'white',
bg: 'blue'
...
3

nope, it doesnt work as expected

4

bg is the correct button prop to set its background color

5

is that happen because of style used in the page ? Maybe something overwrites it…but I do not have a generic button class in the style section

this is full css used in same page

<style>
.call-button-container0 {
  padding-top: 1px;
}
.call-button-container2 {
  padding-top: 160px;
}
.call-button-container1 {
  padding-top: 590px;
}
.call-button-container {
  margin: auto;
  width: 233px;
  height: 80px;
  vertical-align: middle;
  padding: 10px;
  background: #29a3d8;
  -webkit-border-radius: 4px;
  -moz-border-radius: 4px;
  border-radius: 4px;
  font-family: lato-bold;
  font-size: 17px;
  color: white;
}
.end-button-color {
  color: red;
}
.img1 {
  height: 50%;
  width: 50;
}
.a {
  max-height: 700px;
}
.a2 {
  max-height: 700px;
  visibility: hidden
}
.messageLine {
  max-height: 20px;
}
.a2altta {
  max-height: 700px;
  display: flex;
  align-items: center;
  justify-content: center;
  height: 100vh;
}
.a2altta2 {
  display: flex;
  align-items: center;
  justify-content: center;
}
.b {
  max-height: 40px;
  min-height: 40px;
}
.my-class {
  cursor: default;
}
.my-color {
  color: red;
}
.action {
  display: flex;
  align-items: center;
  justify-content: center;
}
.my-cursor {
  cursor: default;
}
.my-font[type="text"]
{
    font-size:24px;
    font-weight: bold;
}
.my-font2 {
  cursor: default;
  font-size:24px;
  color:#29a3d8;
  font-family: Arial;
}
.my-font1 {
  cursor: default;
  font-size:24px;
  font-family: Arial;
}
.my-font1s {
  cursor: default;
  font-family: Arial;
  font-size: 17px
}
.my-size {
 width: 24px;
 height: 24px;
}
.my-size2 {
 width: 24px;
 height: 24px;
}
.flex {
  display: flex;
  margin: 10px;
  padding: 5px;
  border: 0px solid black;
}
.column {
  flex-direction: column;
  padding: 0px;
}
.link {
  color: blue;
  font-size: 30px;
}
.flex2 {
  display: flex;
  margin: 40px;
  padding: 5px;
  border: 0px solid black;
  width: 100%;
}
.localVideo {
  height: 150px;
  width: 150px;
}
.center {
text-align: center
}
</style>