remove close icon from the google map info window

This worked for me with just css

.gm-ui-hover-effect {
    display: none !important;
}

button.gm-ui-hover-effect {
    visibility: hidden;
}

That works as at today in Chrome and Edge

You can try this

::ng-deep .gm-style .gm-style-iw-c button {
    display: none !important;
}

The magic inside it is ::ng-deep modifier that can search deeply for the styles and override them.

.gm-style-iw button>img {
    display: none!important;
}

This code piece will make it to work. In my case image representing the close button was inside button tag in div classed gm-style-iw

Add this in your CSS:

button.gm-ui-hover-effect {
   visibility: hidden;
}

This worked perfectly with Maps API v3.43