CSS quests

html,
body {
    margin: 0;
    padding: 0;
    height: 100%;
    width: 100%;
}
body {
    -webkit-align-items: center;
    -ms-align-items: center;
    align-items: center;
    display: -webkit-flex;
    display: -moz-box;
    display: flex;
    -webkit-flex-direction: column;
    -ms-flex-direction: column;
    flex-direction: column;
    -webkit-justify-content: center;
    -ms-justify-content: center;
    justify-content: center;
    background: linear-gradient(#101, #100, #101);
}
@keyframes flicker1 {
    0% {
        opacity: 1;
    }
    70% {
        opacity: 0.5;
        transform: scale(0.5);
        top: 0;
    }
    100% {
        opacity: 0;
        top: 0;
        transform: scale(0.2);
    }
}
@keyframes flicker2 {
    0% {
        transform: scale(1);
    }
    50% {
        transform: scale(1.2);
        opacity: 1;
    }
    100% {
        transform: scale(1);
    }
}
@keyframes flicker3 {
    0% {
        transform: translateY(0);
    }
    50% {
        transform: translateY(-30px);
    }
    100% {
        opacity: 0.5;
    }
}
@keyframes flicker4 {
    0% {
        opacity: 0.7;
    }
    50% {
        opacity: 1;
    }
    55% {
        opacity: 0;
    }
    60% {
        opacity: 1;
    }
    100% {
        opacity: 0.7;
    }
}
.cont {
    -webkit-align-items: center;
    -ms-align-items: center;
    align-items: center;
    display: -webkit-flex;
    display: -moz-box;
    display: flex;
    -webkit-flex-direction: column;
    -ms-flex-direction: column;
    flex-direction: column;
    -webkit-justify-content: flex-end;
    -ms-justify-content: flex-end;
    justify-content: flex-end;
    height: 500px;
    width: 400px;
}
.fire {
    height: 300px;
    width: 300px;
    position: relative;
}
.circle {
    border-radius: 50%;
    opacity: 0.9;
    position: absolute;
}
.circle:nth-child(3n) {
    mix-blend-mode: screen;
    opacity: 0.8;
}
.circle:nth-child(5n) {
    opacity: 0.7;
}
.circle:nth-child(1) {
    height: 25px;
    width: 25px;
    animation: flicker4 1.3s 0.3s ease-in infinite;
    background: #F6A820;
    top: 5x;
    left: 100px;
}
.circle:nth-child(2) {
    height: 40px;
    width: 40px;
    background: #FCEE33;
    top: 50px;
    left: 100px;
}
.circle:nth-child(3) {
    height: 48px;
    width: 48px;
    animation: flicker3 2s ease-out infinite;
    background: #FCEE33;
    top: 82px;
    left: 88px;
}
.circle:nth-child(4) {
    height: 70px;
    width: 70px;
    background: #F6A820;
    top: 170px;
    left: 120px;
}
.circle:nth-child(5) {
    height: 80px;
    width: 80px;
    animation: flicker1 2s ease-out infinite;
    background: #FCEE33;
    top: 190px;
    left: 100px;
}
.circle:nth-child(6) {
    height: 80px;
    width: 80px;
    animation: flicker2 2s ease infinite;
    background: #F3120E;
    top: 220px;
    left: 90px;
}
.circle:nth-child(7) {
    height: 75px;
    width: 75px;
    background: #FF6F29;
    top: 210px;
    left: 150px;
}
.circle:nth-child(8) {
    height: 56px;
    width: 56px;
    animation: flicker1 2s 1s ease-out infinite;
    background: #F6A820;
    top: 200px;
    left: 65px;
}
.circle:nth-child(9) {
    height: 67px;
    width: 67px;
    background: #FF6F29;
    top: 160px;
    left: 70px;
}
.circle:nth-child(10) {
    height: 50px;
    width: 50px;
    animation: flicker2 1.6s ease-out infinite;
    background: #F3120E;
    top: 140px;
    left: 90px;
}
.circle:nth-child(11) {
    height: 65px;
    width: 65px;
    background: #FCEE33;
    top: 210px;
    left: 40px;
}
.circle:nth-child(12) {
    height: 35px;
    width: 35px;
    animation: flicker3 1.6s ease-out infinite;
    background: #FCEE33;
    top: 246px;
    left: 65px;
}
.circle:nth-child(13) {
    height: 35px;
    width: 35px;
    background: #F6A820;
    top: 260px;
    left: 155px;
}
.circle:nth-child(14) {
    height: 45px;
    width: 45px;
    animation: flicker2 1.4s 0.2s ease-out infinite;
    background: #F6A820;
    top: 150px;
    left: 160px;
}
.circle:nth-child(15) {
    height: 55px;
    width: 55px;
    animation: flicker1 2s 0.8s ease-out infinite;
    background: #FCEE33;
    top: 180px;
    left: 180px;
}
.circle:nth-child(16) {
    height: 30px;
    width: 30px;
    background: #FCEE33;
    top: 110px;
    left: 180px;
}
.circle:nth-child(17) {
    height: 30px;
    width: 30px;
    animation: flicker1 1.5s 0.5s ease-out infinite;
    background: #FCEE33;
    top: 110px;
    left: 180px;
}
.circle:nth-child(18) {
    height: 25px;
    width: 25px;
    background: #F3120E;
    top: 90px;
    left: 177px;
}
.circle:nth-child(19) {
    height: 35px;
    width: 35px;
    background: #F6A820;
    top: 100px;
    left: 120px;
}
.circle:nth-child(20) {
    height: 25px;
    width: 25px;
    animation: flicker4 1s ease-in infinite;
    background: #F3120E;
    top: 82px;
    left: 137px;
}
.circle:nth-child(21) {
    height: 20px;
    width: 20px;
    animation: flicker4 1.3s 0.3s ease-in infinite;
    background: #FF6F29;
    top: 32px;
    left: 130px;
}
.circle:nth-child(22) {
    height: 28px;
    width: 28px;
    animation: flicker4 1.3s 0.3s ease-in infinite;
    background: #FF6F29;
    top: 132px;
    left: 50px;
}
.circle:nth-child(23) {
    height: 16px;
    width: 16px;
    animation: flicker2 1s ease-out infinite;
    background: #FCEE33;
    top: 42px;
    left: 200px;
}
.circle:nth-child(24) {
    height: 68px;
    width: 68px;
    animation: flicker3 2s 0.3s ease-out infinite;
    background: #FCEE33;
    top: 200px;
    left: 190px;
}
.circle:nth-child(25) {
    height: 55px;
    width: 55px;
    background: #FF6F29;
    top: 120px;
    left: 120px;
}
.wood {
    border-radius: 10px;
    height: 40px;
    width: 200px;
    background: black;
}
.wood:first-child {
    transform-origin: top left;
    transform: rotate(30deg);
}
.wood:nth-child(2) {
    transform-origin: top right;
    transform: rotate(-30deg) translateY(-45px);
}