html {
    box-sizing: border-box;
}
* {
    box-sizing: inherit;
}
body {
    padding: 0;
    margin: 100px 0 0;
    height: 100vh;
    text-align: center;
}
.slider {
    position: relative;
    display: inline-block;
    user-select: none;
}
.slider__inner {
    position: relative;
}
.slider__item {
    position: absolute;
    left: 0;
    top: 0;
    opacity: 0;
    transition: 0.6s ease;
}
.slider__item.is-active {
    position: relative;
    opacity: 1;
}
.slider__image {

}
.slider__title {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    color: #fff;
    font-size: 35px;
    text-shadow: 1px 1px 1px #000, 0 0 1em #000;
}
.slider__btn {
    position: absolute;
    color: white;
    cursor: pointer;
    font-size: 18px;
    font-weight: bold;
    transition: 0.6s ease;
    transform: translate(0, -50%);
    top: 50%;
    padding: 18px 18px;
}
.slider__btn:hover {
    background-color: black;
    opacity: 0.8;
}
.slider__btn--prev {
    border-radius: 0 3px 3px 0;
    left: 0;
}
.slider__btn--next {
    border-radius: 3px 0 0 3px;
    right: 0;
}
.slider-dots {
    margin-top: 20px;
}
.slider-dots__item {
    cursor: pointer;
    height: 12px;
    width: 12px;
    border-radius: 50%;
    display: inline-block;
    background-color: #ddd;
    transition: 0.6s ease;
    margin: 0 3px;
}
.slider-dots__item:hover {
    background-color: #aaa;
}
.slider-dots__item.is-active {
    background-color: #aaa;
}