header h1 {
    text-align: center;
    font-size: 22px;
    padding: 15px 10px;
    color: blue;
}
main {
    padding-left: 70px;
    padding-right: 70px;
}
body {
    background-image: linear-gradient(to top, #1e90ff, #99badd);
}
#main-guide {
    border: 4px solid rgba(0, 0, 242, 0.5);
    padding: 15px 15px 15px 10px;
    margin: 5px 10px 20px;
    border-radius: 15px;
    background-color: rgba(0, 0, 255, 0.23);
}
.theory-caption {
    font-weight: bold;
    font-size: 22px;
    padding-left: 5px;
}
#main-guide li {
    padding-bottom: 10px;
    font-weight: bold;
}
.practical-guide {
    border: 4px solid rgba(189, 27, 189, 0.73);
    padding: 15px 15px 15px 10px;
    margin-bottom: 20px;
    margin-left: 10px;
    margin-right: 10px;
    border-radius: 15px;
    background-color: rgba(255, 5, 233, 0.48);
}
.practical-text {
    font-weight: bold;
    font-size: 22px;
    padding-left: 5px;
}

.practical-guide li {
    padding-bottom: 10px;
    font-weight: bold;
}
.how-to {
    border: 4px solid rgba(231, 0, 0, 0.5);
    padding: 20px 20px 15px 10px;
    margin-bottom: 20px;
    margin-left: 10px;
    margin-right: 10px;
    border-radius: 15px;
    background-color: rgba(200, 0, 255, 0.23);
}
.how-to dt{
    font-weight: bold;
    font-size: 22px;
    padding-left: 5px;
    padding-bottom: 5px;
}
.how-to li {
    padding-bottom: 10px;
    font-weight: bold;
    list-style: square;
}