*{
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}
body{
    height: 100vh;
    overflow: hidden;
    background: url('images/body-bgc.jpg') center center;
    display: flex;
    justify-content: center;
    align-items: center;
}

header{
    position: absolute;
    top: -100px;
    left: 0;
    background-color: rgba(236, 214, 181, 0.418);
    width: 100%;
    text-align: center;
    padding: 0.3rem 0;
    font-size: 1.5rem;
    font-family: Tahoma, sans-serif;
    color: #444;
    animation: header 1s forwards;
}
@keyframes header{
    0%{
        top: -1000px;
    }
    100%{
        top: 0px;
    }
}
#container{
    flex: 0 0 80%;
    text-align: center;
    background-color: rgb(236, 200, 146);
    border: 2px solid rgb(236, 214, 181);
    border-radius: 10px;
}
#img-container{
    background: url('images/pic-0.jpeg') center center no-repeat;
    background-size: cover;
    height: 80vh;
    border-radius: 10px;

}

.btn{
    display: block;
    border: none;
    background: none;
    color: rgb(236, 214, 181);
    font-size: 4rem;
    outline: none;
    transition: background;
    transition-duration: 1s;
    overflow-x: hidden;
}
.btn:hover{
    cursor: pointer;
    background-color: rgba(0, 0, 0, 0.418);

}

.btn-left{
    position: absolute;
    top: 10%;
    left: 10.15%;
    padding-left: 0.5rem;
    padding-right: 0.5rem;
    background-color: rgba(0,0,0,0.1);
    height: 80vh;
    border-top-left-radius: 10px;
    border-bottom-left-radius: 10px;

}

.btn-left:active{
    transform: translateX(-3%);
}
.btn-right{
    position: absolute;
    top: 10%;
    right: 10.15%;
    padding-right: 0.5rem;
    padding-left: 0.5rem;
    background-color: rgba(0,0,0,0.1);
    height: 80vh;
    border-top-right-radius: 10px;
    border-bottom-right-radius: 10px;
}

.btn-right:active{
    transform: translateX(3%);
}