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HTML

              
                <svg class="fire" viewBox="0 -20 120 240">
    <defs>
		<linearGradient id="fire-gradient-basic" x1="0%" y1="0%" x2="0%" y2="100%">
			<stop stop-color="#ffb200" offset="0.2" />
			<stop stop-color="#dc0000" offset="1" />
		</linearGradient>
		<linearGradient id="fire-gradient-red" x1="0%" y1="0%" x2="0%" y2="100%">
			<stop stop-color="#ffb200" offset="0" />
			<stop stop-color="#dc0000" offset="0.9" />
		</linearGradient>
		<linearGradient id="fire-gradient-yellow" x1="0%" y1="0%" x2="0%" y2="100%">
			<stop stop-color="#ffb200" offset="0.3" />
			<stop stop-color="#dc0000" offset="1" />
		</linearGradient>
	</defs>

    <g stroke-width="0.5" stroke-opacity="0.5">
		<path class="spark" fill="#ffd700" stroke="#ff0" d="M13 90c-8,-10 -6,-14 -5,-21 3,-3 0,-7 -2,-19 8,11 18,12 7,40l0 0z"></path>
		<path class="spark" fill="#ffd700" stroke="#ff0" d="M36 45c8,-10 6,-14 5,-21 -3,-3 0,-7 2,-19 -8,11 -18,12 -7,40l0 0z"></path>
		<path class="spark" fill="#ffd700" stroke="#ff0" d="M63 48c8,-10 6,-14 5,-21 -3,-3 0,-7 2,-19 -8,11 -18,12 -7,40l0 0z"></path>
		<path class="spark" fill="#ffd700" stroke="#ff0" d="M83 80c-8,-10 -6,-14 -5,-21 3,-3 0,-7 -2,-19 8,11 18,12 7,40l0 0z"></path>
		<path class="spark" fill="#ffd700" stroke="#ff0" d="M94 126c8,-10 6,-14 5,-21 -3,-3 0,-7 2,-19 -8,11 -18,12 -7,40l0 0z"></path>
		<path class="flame" fill="url(#fire-gradient-basic)" stroke="#ff0" d="M46 50c1,13 -15,26 -13,44 0,11 -4,-17 -2,-26 -1,-8 -3,-16 -9,-21 8,42 -28,33 -5,88 -4,-2 -8,-4 -12,-7 4,13 9,21 15,28 9,9 21,13 39,16 13,4 28,2 38,-6 10,-7 15,-19 12,-34 -3,6 -7,10 -13,12 3,-17 -14,-25 -7,-42 10,-20 3,-45 0,-32 -4,12 -11,21 -20,29 22,-70 -10,-53 -11,-88 -9,12 -14,23 -12,39z"></path>
		<path class="flame" fill="url(#fire-gradient-yellow)" stroke="#ff0" d="M51 168c-55,-58 30,-62 -11,-121 11,39 -13,64 -21,76 -5,-15 -1,-21 5,-39 -38,42 -9,63 27,84l0 0z"></path>
		<path class="flame" fill="url(#fire-gradient-yellow)" stroke-width="0.5" stroke="#ff0" d="M55 168c-1,-14 -3,-25 15,-38 31,-22 16,-34 -3,-57 5,22 -4,40 -12,52 -5,8 -23,23 0,43z"></path>
		<path class="flame" fill="url(#fire-gradient-red)" stroke="#ff0" d="M63 172c9,-5 11,-20 12,-37 2,-17 7,-33 34,-36 -11,9 -20,20 -16,41 -1,31 -24,29 -30,32l0 0z"></path>
	</g>
    
    <text font-size="18" fill="#111" x="60" y="195" text-anchor="middle" font-weight="600">ON FIRE</text>
</svg>
              
            
!

CSS

              
                body {
	font-family: sans-serif;
	width: 100%;
	height: 100vh;
	display: -webkit-box;
	display: -ms-flexbox;
	display: flex;
	-ms-flex-pack: distribute;
	justify-content: space-around;
}
svg {
	width: 80px;
}
              
            
!

JS

              
                const fire = document.querySelector('.fire');
let fireTls = [];

initFire();
playFire();

function playFire() {
    fireTls.forEach((tl) => {
        tl.play();
    });
}
function pauseFire() {
    fireTls.forEach((tl) => {
        tl.pause();
    });
}
function initFire() {
    const sparks = Array.from(fire.querySelectorAll('.spark'));
    sparks.forEach((s) => {
        let tl = new gsap.timeline({
            repeat: -1,
            paused: true,
            onRepeat: () => {
                tl.duration(Math.random() + 0.2)
            }
        })
            .fromTo(s, {
                duration: 0.2,
                scale: 2,
                y: 40,
                transformOrigin: 'center bottom'
            }, {
                scale: 0,
                y: -60
            });
        fireTls.push(tl);
    });
    const flames = Array.from(fire.querySelectorAll('.flame'));
    flames.forEach((f, idx) => {
        let tl = new gsap.timeline({
            repeat: -1,
            paused: true,
            onRepeat: () => {
                tl.duration(Math.random() * 0.4 + 0.2)
            }
        })
            .to(f, 0.2, {
                scaleY: 1.1 + (idx ? 0.2 : 0),
                scaleX: idx ? 1 : 0.8,
                transformOrigin: 'center bottom',
                repeat: 1,
                yoyo: true
            });
        fireTls.push(tl);
    });
}
              
            
!
999px

Console