diff --git a/packages/instant/src/components/ui/container.tsx b/packages/instant/src/components/ui/container.tsx
index 228085f519..36d7cf2ec9 100644
--- a/packages/instant/src/components/ui/container.tsx
+++ b/packages/instant/src/components/ui/container.tsx
@@ -1,5 +1,7 @@
+import * as _ from 'lodash';
 import { darken } from 'polished';
 
+import { media } from '../../style/media';
 import { ColorOption, styled } from '../../style/theme';
 import { cssRuleIfExists } from '../../style/util';
 
@@ -34,8 +36,22 @@ export interface ContainerProps {
     overflow?: string;
     darkenOnHover?: boolean;
     flexGrow?: string | number;
+
+    smallWidth?: string;
+    smallHeight?: string;
 }
 
+const mediaStyles = (props: ContainerProps) => {
+    if (!_.some([props.smallWidth, props.smallHeight])) {
+        return '';
+    }
+
+    return media.small`
+        width: ${props.smallWidth || props.width || 'auto'}
+        height: ${props.smallHeight || props.height || 'auto'}
+    `;
+};
+
 // TODO Dont commit flex grow
 export const Container =
     styled.div <
@@ -68,6 +84,7 @@ export const Container =
     ${props => cssRuleIfExists(props, 'cursor')}
     ${props => cssRuleIfExists(props, 'overflow')}
     ${props => (props.hasBoxShadow ? `box-shadow: 0px 2px 10px rgba(0, 0, 0, 0.1)` : '')};
+    ${props => mediaStyles(props)}
     background-color: ${props => (props.backgroundColor ? props.theme[props.backgroundColor] : 'none')};
     border-color: ${props => (props.borderColor ? props.theme[props.borderColor] : 'none')};
     &:hover {
diff --git a/packages/instant/src/components/ui/flex.tsx b/packages/instant/src/components/ui/flex.tsx
index 57abd8b5b5..f85d45e368 100644
--- a/packages/instant/src/components/ui/flex.tsx
+++ b/packages/instant/src/components/ui/flex.tsx
@@ -1,3 +1,6 @@
+import * as _ from 'lodash';
+
+import { media } from '../../style/media';
 import { ColorOption, styled } from '../../style/theme';
 import { cssRuleIfExists } from '../../style/util';
 
@@ -11,8 +14,22 @@ export interface FlexProps {
     backgroundColor?: ColorOption;
     inline?: boolean;
     flexGrow?: number | string;
+
+    smallWidth?: string;
+    smallHeight?: string;
 }
 
+const mediaStyles = (props: FlexProps) => {
+    if (!_.some([props.smallWidth, props.smallHeight])) {
+        return '';
+    }
+
+    return media.small`
+        width: ${props.smallWidth || props.width || 'auto'}
+        height: ${props.smallHeight || props.height || 'auto'}
+    `;
+};
+
 export const Flex =
     styled.div <
     FlexProps >
@@ -26,6 +43,7 @@ export const Flex =
     ${props => cssRuleIfExists(props, 'width')}
     ${props => cssRuleIfExists(props, 'height')}
     background-color: ${props => (props.backgroundColor ? props.theme[props.backgroundColor] : 'none')};
+    ${props => mediaStyles(props)}
 `;
 
 Flex.defaultProps = {
diff --git a/packages/instant/src/components/ui/overlay.tsx b/packages/instant/src/components/ui/overlay.tsx
index 11496e8956..12bde1f2b1 100644
--- a/packages/instant/src/components/ui/overlay.tsx
+++ b/packages/instant/src/components/ui/overlay.tsx
@@ -18,7 +18,7 @@ const PlainOverlay: React.StatelessComponent<OverlayProps> = ({ children, classN
         <Container position="absolute" top="0px" right="0px">
             <Icon height={18} width={18} color={ColorOption.white} icon="closeX" onClick={onClose} padding="2em 2em" />
         </Container>
-        <Container width="100%" height="100%">
+        <Container smallWidth="100%" smallHeight="100%">
             {children}
         </Container>
     </Flex>
diff --git a/packages/instant/src/components/zero_ex_instant_container.tsx b/packages/instant/src/components/zero_ex_instant_container.tsx
index 39b2c9c05b..88c838567e 100644
--- a/packages/instant/src/components/zero_ex_instant_container.tsx
+++ b/packages/instant/src/components/zero_ex_instant_container.tsx
@@ -26,7 +26,7 @@ export class ZeroExInstantContainer extends React.Component<ZeroExInstantContain
     };
     public render(): React.ReactNode {
         return (
-            <Container width="100%" height="100%" position="relative">
+            <Container width="350px" smallWidth="100%" smallHeight="100%" position="relative">
                 <Container zIndex={zIndex.errorPopup} position="relative">
                     <LatestError />
                 </Container>
@@ -37,9 +37,9 @@ export class ZeroExInstantContainer extends React.Component<ZeroExInstantContain
                     borderRadius="3px"
                     hasBoxShadow={true}
                     overflow="hidden"
-                    height="100%"
+                    smallHeight="100%"
                 >
-                    <Flex direction="column" height="100%" justify="flex-start">
+                    <Flex direction="column" smallHeight="100%" justify="flex-start">
                         <SelectedAssetInstantHeading onSelectAssetClick={this._handleSymbolClick} />
                         <SelectedAssetBuyOrderProgress />
                         <LatestBuyQuoteOrderDetails />
diff --git a/packages/instant/src/style/media.ts b/packages/instant/src/style/media.ts
new file mode 100644
index 0000000000..fa7571077f
--- /dev/null
+++ b/packages/instant/src/style/media.ts
@@ -0,0 +1,19 @@
+import { css } from './theme';
+
+export enum ScreenWidths {
+    Sm = 40,
+    Md = 52,
+    Lg = 64,
+}
+
+const generateMediaWrapper = (screenWidth: ScreenWidths) => (...args: any[]) => css`
+    @media (max-width: ${screenWidth}em) {
+        ${css.apply(css, args)};
+    }
+`;
+
+export const media = {
+    small: generateMediaWrapper(ScreenWidths.Sm),
+    medium: generateMediaWrapper(ScreenWidths.Md),
+    large: generateMediaWrapper(ScreenWidths.Lg),
+};