try with the following and if in internet explorer it shows the correct colors in the device or emulator it will also:
:root {
/** primary **/
–ion-color-primary: #03A9F4;
–ion-color-primary-rgb: 2,136,209;
–ion-color-primary-contrast: #ffffff;
–ion-color-primary-contrast-rgb: 255,255,255;
–ion-color-primary-shade: #0278b8;
–ion-color-primary-tint: #1b94d6;
/** secondary **/
–ion-color-secondary: #0cd1e8;
–ion-color-secondary-rgb: 12, 209, 232;
–ion-color-secondary-contrast: #ffffff;
–ion-color-secondary-contrast-rgb: 255, 255, 255;
–ion-color-secondary-shade: #0bb8cc;
–ion-color-secondary-tint: #24d6ea;
/** tertiary **/
–ion-color-tertiary: #7044ff;
–ion-color-tertiary-rgb: 112, 68, 255;
–ion-color-tertiary-contrast: #ffffff;
–ion-color-tertiary-contrast-rgb: 255, 255, 255;
–ion-color-tertiary-shade: #633ce0;
–ion-color-tertiary-tint: #7e57ff;
/** success **/
–ion-color-success: #10dc60;
–ion-color-success-rgb: 16, 220, 96;
–ion-color-success-contrast: #ffffff;
–ion-color-success-contrast-rgb: 255, 255, 255;
–ion-color-success-shade: #0ec254;
–ion-color-success-tint: #28e070;
/** warning **/
–ion-color-warning: #ffce00;
–ion-color-warning-rgb: 255, 206, 0;
–ion-color-warning-contrast: #ffffff;
–ion-color-warning-contrast-rgb: 255, 255, 255;
–ion-color-warning-shade: #e0b500;
–ion-color-warning-tint: #ffd31a;
/** danger **/
–ion-color-danger: #f04141;
–ion-color-danger-rgb: 245, 61, 61;
–ion-color-danger-contrast: #ffffff;
–ion-color-danger-contrast-rgb: 255, 255, 255;
–ion-color-danger-shade: #d33939;
–ion-color-danger-tint: #f25454;
/** dark **/
–ion-color-dark: #222428;
–ion-color-dark-rgb: 34, 34, 34;
–ion-color-dark-contrast: #ffffff;
–ion-color-dark-contrast-rgb: 255, 255, 255;
–ion-color-dark-shade: #1e2023;
–ion-color-dark-tint: #383a3e;
/** medium **/
–ion-color-medium: #989aa2;
–ion-color-medium-rgb: 152, 154, 162;
–ion-color-medium-contrast: #ffffff;
–ion-color-medium-contrast-rgb: 255, 255, 255;
–ion-color-medium-shade: #86888f;
–ion-color-medium-tint: #a2a4ab;
/** light **/
–ion-color-light: #f4f5f8;
–ion-color-light-rgb: 244, 244, 244;
–ion-color-light-contrast: #000000;
–ion-color-light-contrast-rgb: 0, 0, 0;
–ion-color-light-shade: #d7d8da;
–ion-color-light-tint: #f5f6f9;
}
.ion-color-primary {
–ion-color-base:#03A9F4;
–ion-color-base-rgb: 2,136,209;
–ion-color-contrast: #ffffff;
–ion-color-contrast-rgb: 255,255,255;
–ion-color-shade:#0278b8;
–ion-color-tint: #1b94d6;
}