纯 CSS3 卡通小火车行驶动画

<div class="center">   <div class="mountains"></div>   <div class="train">     <div class="engine-front">       <div class="chimney">         <div class="smoke"></div>         <div class="smoke smoke-2"></div>         <div class="smoke smoke-3"></div>         <div class="smoke smoke-4"></div>       </div>     </div>          <div class="engine-body"></div>          <div class="compartment">       <div class="compartment-window"></div>     </div>          <div class="compartment compartment-two">       <div class="compartment-window"></div>     </div>          <div class="compartment compartment-three">       <div class="compartment-window"></div>     </div>          <div class="wheel-holder">       <div class="wheel"></div>       <div class="wheel wheel-2">         <div class="wheel-joint"></div>         <div class="wheel-joint wheel-joint-2"></div>       </div>       <div class="wheel wheel-3"></div>       <div class="wheel wheel-4"></div>       <div class="wheel wheel-5"></div>       <div class="wheel wheel-6"></div>       <div class="wheel wheel-7"></div>       <div class="wheel wheel-8"></div>       <div class="wheel wheel-9"></div>     </div>   </div>   <div class="bridge"></div> </div>

.mountains {   height: 100%;   position: absolute;   width: 100%;   z-index: 1; } .mountains::before, .mountains::after {   background: #000c18;   background: -moz-linear-gradient(#012a53, #000c18 50%);   background: -webkit-linear-gradient(#012a53, #000c18 50%);   background: -o-linear-gradient(#012a53, #000c18 50%);   background: -ms-linear-gradient(#012a53, #000c18 50%);   background: linear-gradient(#012a53, #000c18 50%);   content: "";   height: 100%;   position: absolute; } .mountains::before {   border-radius: 100% 300% 0 0;   left: -20%;   width: 57%; } .mountains::after {   border-radius: 300% 100% 0 0;   right: -20%;   width: 80%; }

.bridge {   border-bottom: 0.3rem solid white;   border-top: 0.3rem solid white;   background: black;   background: -webkit-linear-gradient(55deg, transparent 46%, white 46%, white 54%, transparent 54%) left/1.6rem 2.2rem, -webkit-linear-gradient(-55deg, transparent 46%, white 46%, white 54%, transparent 54%) left/1.6rem 2.2rem;   background: -moz-linear-gradient(55deg, transparent 46%, white 46%, white 54%, transparent 54%) left/1.6rem 2.2rem, -moz-linear-gradient(-55deg, transparent 46%, white 46%, white 54%, transparent 54%) left/1.6rem 2.2rem;   background: -o-linear-gradient(55deg, transparent 46%, white 46%, white 54%, transparent 54%) left/1.6rem 2.2rem, -o-linear-gradient(-55deg, transparent 46%, white 46%, white 54%, transparent 54%) left/1.6rem 2.2rem;   background: -ms-linear-gradient(55deg, transparent 46%, white 46%, white 54%, transparent 54%) left/1.6rem 2.2rem, -ms-linear-gradient(-55deg, transparent 46%, white 46%, white 54%, transparent 54%) left/1.6rem 2.2rem;   background: linear-gradient(55deg, transparent 46%, white 46%, white 54%, transparent 54%) left/1.6rem 2.2rem, linear-gradient(-55deg, transparent 46%, white 46%, white 54%, transparent 54%) left/1.6rem 2.2rem;   bottom: 10rem;   height: 2.6rem;   position: absolute;   width: 100%;   z-index: 1; }

.train {   animation: move-train 24s linear infinite;   bottom: 12.6rem;   height: 10rem;   position: absolute;   left: calc(100% + 1.3rem);   width: 44rem;   z-index: 1; }  .engine-front, .engine-front::before, .engine-front::after {   background: #0f0f0f;   background: linear-gradient(0deg, #0f0f0f, #262626, #0f0f0f);   border: 0.1rem solid rgba(255, 255, 255, 0.15);   border-radius: 50% 0 0 50%;   border-right: none; }  .engine-front {   animation: body-upDown 0.3s infinite;   border-radius: 0.5rem 0 0 0.5rem;   bottom: 1.4rem;   height: 4.6rem;   left: 0;   position: absolute;   width: 8rem; } .engine-front::before, .engine-front::after {   content: "";   position: absolute;   height: 70%;   left: -0.9rem;   top: 50%;   transform: translate(0, -50%);   width: 0.8rem; } .engine-front::after {   height: 40%;   left: -1.4rem;   width: 0.5rem; }  .chimney {   background: #990000;   height: 2.2rem;   left: 2.5rem;   position: absolute;   top: -2.3rem;   width: 1.7rem; } .chimney::before, .chimney::after {   content: "";   position: absolute; } .chimney::before {   animation: up-down 0.3s infinite;   border-bottom: none;   border-left: 0.5rem solid transparent;   border-right: 0.5rem solid transparent;   border-top: 0.8rem solid orange;   left: 50%;   top: -0.9rem;   transform: translate(-50%, 0);   width: 160%; }  .smoke {   animation: move-smoke 0.4s linear infinite;   background: rgba(255, 255, 255, 0.8);   border-radius: 50%;   height: 1.4rem;   left: 0.2rem;   position: absolute;   top: -1.5rem;   width: 0.8rem;   z-index: -1; } .smoke-2 {   animation-delay: 0.1s;   left: 0.4rem; } .smoke-3 {   animation-delay: 0.2s;   left: 0.6rem; } .smoke-4 {   left: 0.8rem; }  .engine-body {   animation: body-upDown 0.3s 0.1s infinite;   background: #b30000;   background: linear-gradient(0deg, #330000, red, #990000);   border-radius: 0 0 0.4rem 0;   bottom: 1.4rem;   height: 7rem;   left: 8rem;   position: absolute;   width: 5rem; } .engine-body::before, .engine-body::after {   content: "";   left: 50%;   position: absolute;   transform: translate(-50%, 0); } .engine-body::before {   animation: up-down 0.3s 0.2s infinite;   background: #660000;   background: linear-gradient(0deg, #660000, #990000, #660000);   border-radius: 50% 50% 0 0;   height: 1.2rem;   top: -1.2rem;   width: 130%; } .engine-body::after {   background: #b3e0f2;   border-radius: 0.2rem;   height: 40%;   top: 1rem;   width: 45%; }  .wheel::before, .wheel::after {   left: 50%;   top: 50%;   transform: translate(-50%, -50%); }  .wheel-holder {   height: 2.8rem;   bottom: 0;   position: absolute;   width: 100%; }  .wheel {   animation: rotate 2s linear infinite;   background: orange;   border: 0.3rem solid rgba(0, 0, 0, 0.6);   border-radius: 50%;   height: 2.8rem;   left: 1rem;   position: absolute;   width: 2.8rem; } .wheel-2 {   left: 4.5rem; } .wheel-3 {   border-width: 0.5rem;   height: 3.8rem;   left: 8.7rem;   top: -1.1rem;   width: 3.8rem; } .wheel-4 {   left: 15.7rem; } .wheel-5 {   left: 19.5rem; } .wheel-6 {   left: 25.7rem; } .wheel-7 {   left: 29.5rem; } .wheel-8 {   left: 35.7rem; } .wheel-9 {   left: 39.5rem; } .wheel::before, .wheel::after {   content: "";   position: absolute; } .wheel::before {   background: rgba(0, 0, 0, 0.3);   height: 86%;   width: 0.2rem; } .wheel::after {   background: #996300;   background: -webkit-radial-gradient(circle at center, #b37400 30%, #996300 30%);   background: -moz-radial-gradient(circle at center, #b37400 30%, #996300 30%);   background: -o-radial-gradient(circle at center, #b37400 30%, #996300 30%);   background: -ms-radial-gradient(circle at center, #b37400 30%, #996300 30%);   background: radial-gradient(circle at center, #b37400 30%, #996300 30%);   border-radius: 50%;   height: 40%;   width: 40%; }  .compartment {   animation: body-upDown 0.3s infinite;   background: #186c8e;   background: -webkit-linear-gradient(#104b63 50%, #1f8dba);   background: -moz-linear-gradient(#104b63 50%, #1f8dba);   background: -o-linear-gradient(#104b63 50%, #1f8dba);   background: -ms-linear-gradient(#104b63 50%, #1f8dba);   background: linear-gradient(#104b63 50%, #1f8dba);   border-radius: 0 0 0.3rem 0.3rem;   bottom: 1.4rem;   height: 5rem;   left: 15rem;   position: absolute;   width: 8rem; } .compartment-two {   animation: body-upDown 0.3s 0.1s infinite;   left: 25rem; } .compartment-two .compartment-window::before {   animation: up-down 0.3s 0.3s infinite; } .compartment-three {   animation: body-upDown 0.3s 0.2s infinite;   left: 35rem; } .compartment-three .compartment-window::before {   animation: up-down 0.35s infinite; } .compartment::before, .compartment::after {   background: black;   border: 0.4rem solid transparent;   bottom: 0.4rem;   box-shadow: 0 0 0 1px rgba(255, 255, 255, 0.1);   content: "";   height: 0.8rem;   position: absolute;   width: 0.9rem; } .compartment::before {   border-left: 0.4rem solid rgba(255, 255, 255, 0.3);   left: -0.9rem; } .compartment::after {   border-right: 0.4rem solid rgba(255, 255, 255, 0.3);   left: -2rem; }  .compartment-window {   background: #1f8dba;   background: -moz-linear-gradient(90deg, transparent 0.8rem, skyblue 0.8rem) left/2.4rem 100%;   background: -webkit-linear-gradient(90deg, transparent 0.8rem, skyblue 0.8rem) left/2.4rem 100%;   background: -o-linear-gradient(90deg, transparent 0.8rem, skyblue 0.8rem) left/2.4rem 100%;   background: -ms-linear-gradient(90deg, transparent 0.8rem, skyblue 0.8rem) left/2.4rem 100%;   background: linear-gradient(90deg, transparent 0.8rem, skyblue 0.8rem) left/2.4rem 100%;   height: 40%;   position: absolute;   top: 0.7rem;   width: 100%; } .compartment-window::before, .compartment-window::after {   content: "";   position: absolute; } .compartment-window::before {   animation: up-down 0.3s 0.1s infinite;   background: #104b63;   border-radius: 50% 50% 0 0;   height: 0.6rem;   left: 50%;   top: -1.4rem;   transform: translate(-50%, 0);   width: 110%; }

@keyframes up-down {   0%, 100% {     transform: translate(-50%, 0);   }   50% {     transform: translate(-50%, -0.3rem);   } } @keyframes rotate {   100% {     transform: rotate(-360deg);   } } @keyframes move-train {   100% {     transform: translateX(-154rem);   } } @keyframes body-upDown {   0%, 100% {     transform: translateY(0);   }   100% {     transform: translateY(-0.2rem);   } } @keyframes move-smoke {   0% {     -webkit-filter: blur(0);     -moz-filter: blur(0);     -o-filter: blur(0);     -ms-filter: blur(0);     filter: blur(0);     opacity: 1;   }   50% {     -webkit-filter: blur(0.2rem);     -moz-filter: blur(0.2rem);     -o-filter: blur(0.2rem);     -ms-filter: blur(0.2rem);     filter: blur(0.2rem);     opacity: 0.6;     transform: translate(0, -3rem) scale(2);   }   100% {     -webkit-filter: blur(0.3rem);     -moz-filter: blur(0.3rem);     -o-filter: blur(0.3rem);     -ms-filter: blur(0.3rem);     filter: blur(0.3rem);     opacity: 0;     transform: translate(2.5rem, -6rem) scale(3);   } } @keyframes wheel-joint {   100% {     transform: rotate(360deg);   } }