#search::-webkit-input-placeholder { color: #909; }

you will have to enter one for each browser. Looks like you are using the porto theme so the following code will work just place it in your custom css box in theme settings panel. Change the color to whatever you prefer.

#search::-webkit-input-placeholder { /* WebKit, Blink, Edge / color: #909; } #search:-moz-placeholder { / Mozilla Firefox 4 to 18 / color: #909; opacity: 1; } #search::-moz-placeholder { / Mozilla Firefox 19+ / color: #909; opacity: 1; } #search:-ms-input-placeholder { / Internet Explorer 10-11 */ color: #909; }

#search::-webkit-input-placeholder {
    color: #909;
}

You will have to enter one for each browser. Looks like you are using the porto theme so the following code will work just place it in your custom css box in theme settings panel. Change the color to whatever you prefer.

#search::-webkit-input-placeholder { /* WebKit, Blink, Edge */
    color:    #909;
}
#search:-moz-placeholder { /* Mozilla Firefox 4 to 18 */
   color:    #909;
   opacity:  1;
}
#search::-moz-placeholder { /* Mozilla Firefox 19+ */
   color:    #909;
   opacity:  1;
}
#search:-ms-input-placeholder { /* Internet Explorer 10-11 */
   color:    #909;
}