header {
    text-align: center;
}

h1 {
    font-size: 90px;
}

button {
    box-sizing: border-box;
    font-size: 70px;
    background: none;
    border: none;
    color: rgb(11, 80, 184);
    position: relative;
}

.l_btn {
    right: 600px;
}

.l_btn:hover {
    font-size: 80px;
}

.r_btn {
    left: 600px;
}

.r_btn:hover {
    font-size: 80px;
}

.main-img {
    text-align: center;
}

.imgs {
    border: solid gray 10px;
}

.imgs div {
    display: inline;
    padding: 10px;
}

.imgs img {
    max-width: 200px;
}