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Customize Slider Thumb

Slider appearance can be customized through CSS. By overriding the slider CSS classes, you can customize the thumb. By default, slider has unique class e-handle for slider thumb. You can override the following class as per your requirement. Here, in the sample, the slider thumb has been customized to square, circle, oval shapes, and background image has also been customized.

.e-control.e-slider .e-handle {
    background-image: url('https://ej2.syncfusion.com/demos/src/slider/images/thumb.png');
    background-color: transparent;
    height: 25px;
    width: 25px;
}
#square_slider.e-control.e-slider .e-handle {
    border-radius: 0%;
    background-color: #f9920b;
    border: 0;
}
#circle_slider.e-control.e-slider .e-handle {
    border-radius: 50%;
    background-color: #f9920b;
    border: 0;
}
#oval_slider.e-control.e-slider .e-handle {
    height: 25px;
    width: 8px;
    top: 3px;
    border-radius: 15px;
    background-color: #f9920b;
}
razor
custom-thumb.cs
@using Syncfusion.EJ2
@using Syncfusion.EJ2.Inputs
     <div id='container'>
        <div class="col-lg-12 control-section">
            <div class="slider-content-wrapper">
                <div class="slider_container">
                    <div class="labelText slider-userselect">Square</div>
                    <!-- Square slider element -->
                    @Html.EJS().Slider("square_slider").Min(0).Max(100).Value(30).Enabled(true).Render()
                </div>
                <div class="slider_container">
                    <div class="labelText slider-userselect">Circle</div>
                    <!-- Circle slider element -->
                    @Html.EJS().Slider("circle_slider").Min(0).Max(100).Value(30).Enabled(true).Render()
                </div>
                <div class="slider_container">
                    <div class="labelText slider-userselect">Oval</div>
                    <!-- Oval slider element -->
                    @Html.EJS().Slider("oval_slider").Min(0).Max(100).Value(30).Enabled(true).Render()
                </div>
                <div class="slider_container">
                    <div class="labelText slider-userselect">Custom image</div>
                    <!-- Image slider element -->
                    @Html.EJS().Slider("image_slider").Value(30).Tooltip(new SliderTooltipData { IsVisible = true, Placement = TooltipPlacement.After}).Render()
                </div>
            </div>
        </div>
    </div>

<style>
.slider-content-wrapper {
  width: 40%;
  margin: 0 auto;
  min-width: 185px;
}

.slider-userselect {
  -webkit-user-select: none;
  /* Safari 3.1+ */
  -moz-user-select: none;
  /* Firefox 2+ */
  -ms-user-select: none;
  /* IE 10+ */
  user-select: none;
  /* Standard syntax */
}

.labelText {
  text-align: left;
  font-weight: 500;
  font-size: 13px;
  padding-bottom: 10px;
}

.slider_container {
  margin-top: 40px;
}

.e-bigger .content-wrapper {
  width: 80%;
}

#square_slider .e-handle {
  border-radius: 0;
  background-color: #f9920b;
  border: 0;
}

#circle_slider .e-handle {
  background-color: #f9920b;
  border-radius: 50%;
  border: 0;
}

#image_slider .e-handle {
  height: 25px;
  width: 24px;
  background-size: 24px;

}

#image_slider .e-handle {
  background-image: url('https://ej2.syncfusion.com/demos/src/slider/images/thumb.png');
  background-repeat: no-repeat;
  background-color: transparent;
  border: 0;
}

#square_slider .e-tab-handle::after,
#circle_slider .e-tab-handle::after {
  background-color: #f9920b;
}

#image_slider .e-tab-handle::after {
  background-color: transparent;
}

#oval_slider .e-handle {
  height: 25px;
  width: 8px;
  top: 3px;
  border-radius: 15px;
  background-color: #f9920b;
}
</style>
public ActionResult TimeFormat()
{
    return View();
}

ASP .NET Core - Slider - Thumb Customization