Changing border color in mat-form-field

Question

I am using angular material mat-form-field. I have a dark background, and therefore am trying to change the border of the form-field to white. But I am not able

Answer 1

I think this will cover everything.

// mat-icon-stepper selected color change 
::ng-deep .mat-step-header .mat-step-icon-selected, .mat-step-header .mat-step-icon-state-done, .mat-step-header .mat-step-icon-state-edit {
    background-color: red!important;
}

//input outline color
::ng-deep .mat-form-field-appearance-outline .mat-form-field-outline {
    color: red!important;
    // opacity: 1!important;
}

//mat-input focused color
::ng-deep .mat-form-field-appearance-outline.mat-focused .mat-form-field-outline-thick {
    color: red!important;
}

// mat-input error outline color
::ng-deep .mat-form-field-appearance-outline.mat-form-field-invalid.mat-form-field-invalid .mat-form-field-outline-thick{
    color: red!important;
    opacity: 0.8!important;
}

// mat-input carent color
::ng-deep .mat-input-element {
    caret-color: red!important;
}

// mat-input error carent color
::ng-deep .mat-form-field-invalid .mat-input-element, .mat-warn .mat-input-element {
    caret-color: red!important;
}

// mat-label normal state style
::ng-deep .mat-form-field-label {
    color: rgba(0,0,0,.6)!important;
    // color: $mainColor!important;
}

// mat-label focused style
::ng-deep .mat-form-field.mat-focused .mat-form-field-label {
    color: red!important;
}

// mat-label error style
::ng-deep .mat-form-field.mat-form-field-invalid .mat-form-field-label {
    color: red!important;
}

Answer 2

SCSS version of @sasa with colors as variables

::ng-deep {
   $custom-main-color: red;
   $custom-label-color: rgba(0, 0, 0, .6);

   // mat-icon-stepper selected color change
   .mat-step-header .mat-step-icon-selected, .mat-step-header .mat-step-icon-state-done, .mat-step-header .mat-step-icon-state-edit {
      background-color: $custom-main-color !important;
   }

   // input outline color
   .mat-form-field-appearance-outline .mat-form-field-outline {
      color: $custom-main-color !important;
   }

   // mat-input focused color
   .mat-form-field-appearance-outline.mat-focused .mat-form-field-outline-thick {
      color: $custom-main-color !important;
   }

   // mat-input error outline color
   .mat-form-field-appearance-outline.mat-form-field-invalid.mat-form-field-invalid .mat-form-field-outline-thick {
      color: $custom-main-color !important;
      opacity: 0.8 !important;
   }

   // mat-input caret color
   .mat-input-element {
      caret-color: $custom-main-color !important;
   }

   // mat-input error caret color
   .mat-form-field-invalid .mat-input-element, .mat-warn .mat-input-element {
      caret-color: $custom-main-color !important;
   }

   // mat-label normal state style
   .mat-form-field-label {
      color: $custom-label-color !important;
   }

   // mat-label focused style
   .mat-form-field.mat-focused .mat-form-field-label {
      color: $custom-main-color !important;
   }

   // mat-label error style
   .mat-form-field.mat-form-field-invalid .mat-form-field-label {
      color: $custom-main-color !important;
   }
}

Answer 3

Add this CSS to your form-field-appearance-example.css:

/* Border */
.mat-form-field-appearance-outline .mat-form-field-outline {
  color: white;
}
/* Font color */
input.mat-input-element {
  color: white;
}

Though, there is still a problem while the field is focused.

Answer 4

I had tried many things, finally, I am able to change the bottom line (which we are thinking is a border, which is actually not a border), using this:

::ng-deep.mat-form-field.mat-focused .mat-form-field-ripple{
    background-color: black;
}

That colored line is actually span filled with color! Hope this helps :)

Answer 5

try this , add/remove ::ng-deep if required

 ::ng-deep .mat-form-field-appearance-outline .mat-form-field-outline-end {
                border-radius: 1px !important;
                border: 1px solid  red;
                border-left:none;
              }
            ::ng-deep .mat-form-field-appearance-outline .mat-form-field-outline-start {
                border-radius: 1px !important;
                border: 1px solid red;
                border-right:none;
              }
              ::ng-deep .mat-form-field-appearance-outline .mat-form-field-outline-gap {
                border-radius: 1px !important;
                border-bottom: 1px solid   red;
              }

Answer 6

remove boder and add box-shadow :

::ng-deep .mat-form-field-appearance-outline .mat-form-field-outline-end {
        border-radius: 50% !important;
        border: none;
        border-left: none;
    }
    ::ng-deep .mat-form-field-appearance-outline .mat-form-field-outline-start {
        border-radius: 1px !important;
        border: none;
        border-right: none;
    }
    ::ng-deep .mat-form-field-appearance-outline .mat-form-field-outline-gap {
        border-radius: 1px !important;
        border-bottom: none;
    }
    
    ::ng-deep.mat-form-field-appearance-outline .mat-form-field-outline {
        box-shadow: -5px -5px 20px #fff, 5px 5px 20px #babecc;
        border-radius: 15px;
    }