Why Do Multiple 100vw Containers Cause Horizontal Overflow?

Horizontal Overflow Issue with Multiple 100vw Containers

Having multiple containers with a width of 100vw can cause horizontal overflow, even though 100vw is typically considered to represent the full width of the viewport.

One reason for this issue is that 100vw refers to the entire visible screen width, including the width of any browser toolbars or scrollbars. When you add another 100vw container, the total width exceeds the visible screen width, resulting in horizontal overflow.

To resolve this issue, you can add a maximum width constraint to the containers. This ensures that they will never exceed the viewport width, even if multiple containers are present:

.box {
    width: 100vw;
    height: 100vh;
    max-width: 100%;
}

By adding the max-width: 100% rule, you effectively limit the width of each container to the available viewport width. This prevents the containers from overflowing horizontally, while still maintaining their dynamic resizing behavior based on the viewport width.

By applying this fix, you can prevent horizontal overflow when using multiple 100vw containers, ensuring a consistent and responsive layout across different viewport sizes.

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