How can CSS animation cause an object to smoothly move into the block?

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To smoothly move an object into a block, you can use CSS animation with the transform property. The steps to achieve this effect are:

1. Define the container block where the object will move in and the object itself.

<div class="container">
    <div class="object"></div>
</div>

1. Define the container's position property to be relative so that its child elements can be positioned absolutely according to it.

.container {
    position: relative;
}

1. Define the object's initial position and transform it outside the container.

.object {
    position: absolute;
    left: -100px;
    top: 50px;
}

1. Define the animation with the keyframes of where the object will start and where it will end inside the container.

@keyframes move-in {
    from {
        transform: translateX(-100px);
    }
    to {
        transform: translateX(0);
    }
}

1. Apply the animation to the object and set its duration and easing for a smooth movement.

.object {
    animation: move-in 1s ease-out forwards;
}

By following these steps, the object will smoothly move into the block as it's animated with the defined keyframes and properties.