:root {
    --white: #f0f8ff;
}

body {
    padding: 30px;
    background: #5f6b81;
    color: var(--white);
    text-shadow: 1px 1px 2px #000;
    font-family: 'Open Sans', 'Arial', sans-serif;
}

.conteiner {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 15px;
    height: 100%;
}

/* ---------------------------------------------------------- */

h1 {
    font-size: 3rem;
    text-align: center;
    text-transform: uppercase;
    font-style: normal;
    margin: 2rem;
}

.lesson {
    font-size: 20px;
    line-height: 30px;
    text-align: justify;
    font-style: italic;
    padding-bottom: 15px;
}

h2 {
    font-size: 1.7rem;
    margin: 1rem;
}

/* ---------------------------------------------------------- */

pre {
    background: #37394b;
    line-height: 20px;
    border: 1px solid var(--white);
    border-left: 4px solid #7693b8;
    max-width: 100%;
    overflow: auto;
    display: block;
    font-style: normal;
    padding: 15px;
    margin: 15px 0;
    letter-spacing: 3px;
}

.lesson__answer-js {
    font-family: 'Open Sans', 'Arial', sans-serif;
    font-size: 14px;
    text-align: justify;
    font-style: normal;
    color: var(--white);
    text-shadow: 1px 1px 2px #000000;
}

/* --------------------------------- */

.lesson__list {
    padding: 15px;
    font-size: 24px;
    margin: 50px 0;
    border-radius: 10px;
    border: 2px solid #D0DCE7;
}

.lesson__list-item {
    margin-bottom: 15px;
    gap: 18px;
    text-align: center;
    transition: all .5s;
}

.lesson__list-item:hover {
    color: #7693b8;
    font-size: 1.7rem;
}

/* ---------------------------------------------------- */

.button {
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 500;
    font-size: 23px;
    line-height: calc(20px / 16px);
    color: #37394b;
    background: #d0dce7;
    height: 56px;
    width: 100%;
    max-width: 288px;
    border-radius: 100px;
    transition: all .5s;
    margin: 0 auto;
    text-shadow: 1px 1px 2px #96969a;
    font-style: normal;
    margin-top: 15px;
}

.button:hover {
    color: var(--white);
    background: #37394b;
    text-shadow: 1px 1px 2px #000000;
}