div.slide-show {
width: 400px; /* スライドショーの幅 */
max-width: 100%; /* スマホで表示が欠けないように */
margin: 10px auto; /* 中央揃え */
position: relative;
}

.slide-show img {
animation: show 16s infinite; /* 12秒のスライドショーを繰り返し */
max-width: 100%;
height: auto;
opacity: 0;
position: absolute; /* 画像を重ねて表示 */
left: 0;
top: 0;
}

@keyframes show {
0% {opacity: 0}
17% {opacity: 1}
33% {opacity: 1}
50% {opacity: 0}
}

.slide-show img:nth-of-type(1) {
position: relative;
}

.slide-show img:nth-of-type(2) {
animation-delay: 0s;
}

.slide-show img:nth-of-type(3) {
animation-delay: 4s;
}

.slide-show img:nth-of-type(4) {
animation-delay: 8s;
}

.slide-show img:nth-of-type(5) {
animation-delay: 12s;
}