.sec1-box {
    margin: 0 0 15px;
    height: 200px;
    animation: animate 20s infinite linear;
	background-blend-mode: soft-light;
	background-image: url(../images/sec1-img1.jpg);
	background-size:cover;
	background-repeat:no-repeat;
	background-position: center;
}
@keyframes animate {
	0%{background-image: url(https://twinklepapers.com/images/auto-1.jpg);}
	20%{background-image: url(https://twinklepapers.com/images/auto-2.jpg);}
	40%{background-image: url(https://twinklepapers.com/images/auto-3.jpg);}
	60%{background-image: url(https://twinklepapers.com/images/auto-4.jpg);}
	80%{background-image: url(https://twinklepapers.com/images/auto-5.jpg);}
	100%{background-image: url(https://twinklepapers.com/images/auto-2.jpg);}
}