.section {
    margin: 0;
    padding: 0;
    height: 82vh;
    display: flex;
    justify-content: center;
    align-items: center;
}

.slider {

    width: 100%;
    height: 100%;

    overflow: hidden;
}

.slide {
    width: 500%;
    height: 100%;
    display: flex;
}

.slide input {
    display: none;
}

.st {
    width: 20%;
    transition: 2s;
}

.st img {
    width: 100%;
    height: 100%;
}

.nav-m {
    position: absolute;
    width: 99%;
    margin-top: 10px;
    justify-content: center;
    display: flex;

}

.m-btn {
    border: 2px solid #358cd8;
    padding: 5px;
    border-radius: 10px;
    cursor: pointer;
    transition: 1s;

}

.m-btn:not(:last-child) {
    margin-right: 30px;

}

.m-btn:hover {
    background-color: #358cd8;
}

#radio1:checked~.first {
    margin-left: 0;
}

#radio2:checked~.first {
    margin-left: -20%;
}

#radio3:checked~.first {
    margin-left: -40%;
}

#radio4:checked~.first {
    margin-left: -60%;
}


.nav-auto div {
    border: 2px solid #000;
    padding: 5px;
    border-radius: 10px;
    margin-top: auto;
    transition: 1s;
}

.nav-auto div:not(:last-child) {
    margin-right: 30px;
    justify-content: center;
}

#radio1:checked~.nav-auto .a-b1 {
    background-color: saddlebrown;

}

#radio1:checked~.nav-auto .a-b2 {
    background-color: saddlebrown;

}

#radio1:checked~.nav-auto .a-b3 {
    background-color: saddlebrown;

}

#radio1:checked~.nav-auto .a-b4 {
    background-color: saddlebrown;

}