CSS 애니메이션으로 웹사이트를 다이내믹하게 만들기

In this blog we will take a look at creating a simple animation to help dynammise a website. Movement attracts attention and thus CSS animations are perfect for captivating your audiance.

However remember to not do to many animations, the goal isn't to loose the audiance in this blog we will look at how to make an animated logo to captivate your audiance to look at it.

Here is what the logo looks like:

<div class="fire">
    <div class="fire-left">
        <div class="main-fire"></div>
        <div class="particle-fire"></div>
    </div>
    <div class="fire-main">
        <div class="main-fire"></div>
        <div class="particle-fire"></div>
    </div>
    <div class="fire-right">
        <div class="main-fire"></div>
        <div class="particle-fire"></div>
    </div>
    <div class="fire-bottom">
        <div class="main-fire"></div>
    </div>
</div>

We can see here we have four fire components:

• The left flame
• The middle flame
• The right flame
• The bottom glow

We will take a look at the middle flame since the left and right are just a smaller version.

Here is the CSS code:

.fire-main {
    position: absolute;
    height: 100%;
    width: 100%;
    animation: scaleUpDown 3s ease-out;
    animation-iteration-count: infinite;
    animation-fill-mode: both;
}

.fire-main .main-fire {
    position: absolute;
    width: 100%;
    height: 100%;
    background-image: radial-gradient(farthest-corner at 10px 0, #d43300 0%, #ef5a00 95%);
    transform: scaleX(0.8) rotate(45deg);
    border-radius: 0 40% 60% 40%;
    filter: drop-shadow(0 0 10px #d43322);
}

fire-main being the parent div we make sure that it uses all the height and width of the parent div. It is also on this dive were we are casting the animation.

We say the animation should play for 3s and ease-out and that it should iterate for infinite .

main-fire is were we replicate the flame. This is quite simple. Using border-radius: 0 40% 60% 40%; we can create a nice tear drop we then finish the orientation and scaling with transform: scaleX(0.8) rotate(45deg);

To make the fire more realistic lets build some small particle that floats up.

.fire-main .particle-fire {
    position: absolute;
    top: 60%;
    left: 45%;
    width: 10px;
    height: 10px;
    background-color: #ef5a00;
    border-radius: 50%;
    filter: drop-shadow(0 0 10px #d43322);
    animation: particleUp 2s ease-out 0;
    animation-iteration-count: infinite;
    animation-fill-mode: both;
}

Since the width and height have the same value of 10px coupled with a border-radius: 50% it gives us a circle. adding a little drop-shadow to be able to really give a sense of depth.

The idea of the flam animation is pretty simple. We start off at the normal size we then make the flam grow taller then grow smaller while making it thinner.

@keyframes scaleUpDown {
    0%,
    100% {
        transform: scaleY(1) scaleX(1);
    }
    50%,
    90% {
        transform: scaleY(1.2);
    }
    75% {
        transform: scaleY(0.95);
    }
    80% {
        transform: scaleX(0.55);
    }
}

Let's take a look at this by time (percentage of animation completed):

• 0% the flame is scaled to (1,1) (x,y)
• 50% taller flame scaled to (1, 1.2)
• 75% smaller flame scaled to (1, 0.95)
• 80% thinner flame scaled to (0.55, 0.95)
• 90% taller flame scaled to (0.55, 1.2)
• 100% normal flame scaled to (1,1)

The particle animation is pretty simple it is a simple going up animation mixed with some opacity changes.

@keyframes particleUp {
    0% {
        opacity: 0;
    }
    20% {
        opacity: 1;
    }
    80% {
        opacity: 1;
    }
    100% {
        opacity: 0;
        top: -100%;
        transform: scale(0.5);
    }
}

Let's take a look at this by time (percentage of animation completed):

• 0% the flame is invisible opacity: 0;
• 20% the flame is visible opacity: 1;
• 80% the flame is visible opacity: 1;
• 100% the flame moves to top top: -100%; and is invisible opacity: 0; and smaller transform: scale(0.5);

If you are not used to CSS animations you might be wondering why should we have the same line for 20% and 80%. WWell te way animations work are per the last change. Hence if I didnt have the 80% from 20% to 100% it would slowly change the opacity to 0. However if we want a faster opacity change and only at the end but saying at 80% that opacity: 1; then it will only become 0 between 80% and 100%

The last touch to this flame animation is the glow.
for this we have a very simple div with the following style:

.fire-bottom .main-fire {
    position: absolute;
    top: 30%;
    left: 20%;
    width: 75%;
    height: 75%;
    background-color: #ff7800;
    transform: scaleX(0.8) rotate(45deg);
    border-radius: 0 40% 100% 40%;
    filter: blur(10px);
    animation: glow 2s ease-out 0;
    animation-iteration-count: infinite;
    animation-fill-mode: both;
}

Most of this css is the same as the simple flame we saw above the main difference comes from filter: blur(10px); this will give a sligh blur to our flame shape.

Taking a look at the glow animation:

@keyframes glow {
    0%,
    100% {
        background-color: #ef5a00;
    }
    50% {
        background-color: #ff7800;
    }
}

we simply see that we change the color from a dark orange to light orange.

We can see that quite easily and using only HTML and CSS3 that we can really capture user attention to the logo. This can easily help with the branging. this can be used on a very simple login page for instance with either a two panel (logo left, login form right) or a simple logo above the login form.