body {
    box-sizing: border-box;
}

main {
    width: 90%;
    max-width: 1180px;
    margin: 0 auto;
}

h1 {
    margin: 0;
}

.img {
    width: 100%;
}


.icon {
    width: 100px;
}

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

.flex {
    display: flex;
}

.w-400px {
    width: 400px;
}

.w-600px {
    width: 600px;
}

.mw-800 {
    width: 80%;
    max-width: 800px;
}

.mx-auto {
    margin-right: auto;
    margin-left: auto;
}

.mx-3 {
    margin-right: 30px;
    margin-left: 30px;
}

.py-1 {
    padding-top: 10px;
    padding-bottom: 10px;
}

.justify-center {
    justify-content: center;
}

.border-blue {
    border: #4472c4 solid 1px;
}

.centered {
    display: block;
    margin-left: auto;
    margin-right: auto;
    text-align: center;
    vertical-align: middle;
}

.section-top {
    display: flex;
    justify-content: space-around;
    padding-top: 30px;
    padding-bottom: 50px;
    border-bottom: 1px dashed #000000;
}

.section-bottom {
    padding: 40px;
}

.how-to-title {
    width: 600px;
    margin: 0 auto;
    padding-top: 20px;
    padding-bottom: 20px;
    color: white;
    background-color: #4472c4;
    border-radius: 15px;
}

.how-to-part {
    padding: 0 25px;
    margin-bottom: 40px;
    box-sizing: border-box;
}

.how-to .text {
    margin-bottom: 30px;
}

.button {
    font-size: 20px;
}

.button-link {
    color: #000000;
    text-decoration: none;
    display: inline-block;
    padding: 10px 30px;
    border: 1px solid #000000;
    border-radius: 20px;
}

.arrow {
    margin: 30px auto;
    width: 80px;
}

@media screen and (max-width: 820px) {
    .how-to-part {
        width: 50%;
    }

    .button {
        font-size: 16px;
    }

    .button-link {
        padding: 10px 20px;
    }
}

@media screen and (max-width: 480px) {
    .how-to-part {
        width: 95%;
        margin: 0 auto;
    }
}