header {
    padding: 80px 25px;
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 50px;
    flex-wrap: wrap;
}

.header_text {
    width: 850px;
    h1 {
        font-size: 45px;
    }
}

.header_text_top {
    h1 {
        font-size: 60px;
    }
}

.circle {
    height: 400px;
    width: 400px;
    max-height: 80vw;
    max-width: 80vw;
    overflow: hidden;
    border-radius: 50%;
    border: 7px solid var(--light-primary-color);
    display: flex;
    justify-content: center;
    align-items: center;
}

.themes {
    height: 120px;
    width: 350px;
}

.circle img {
    width: 100%;
}


/* ========= nav ================*/

nav {
    list-style-type: "☰";
    margin-bottom: 80px;
}

nav ul {
    list-style: none;
    display: flex;
    gap: 20px;
}

nav a {
    color: var(--secondary-text-color);
    text-decoration: none;
    position: relative;
    padding: 3px;
}

nav a:hover {
    color: var(--text-color);
}

nav a::after {
    content: '';
    height: 2px;
    width: 0;
    background: var(--main-brand-color);
    position: absolute;
    bottom: 0;
    left: 0;
    transition: 150ms ease-in-out;
}

nav a:hover::after {
    width: 100%;
}

.index_section1 {
    text-align: center;
    color: #B3B4B6;
}

.image-container {
    text-align: center;
    color: #B3B4B6;
}

.index_section1 img {
    width: 100%;
}

.image-container img {
    width: 100%;
}

.index_section1 p {
    margin: 25px 0;
    font-size: 20px;
}

#toggle_button {
    display: none;
}

label[for="toggle_button"] {
    display: none;
}

label[for="toggle_button"] span {
    font-size: 40px;
}

@media(max-width: 900px) {
    .subheading {
        text-align: left;
    }
    h2 {
        text-align: right;
    }
    nav {
        position: absolute;
        top: 0;
        left: 0;
        background: var(--secondary-color);
        padding: 15px;
        border-radius: 0 0 25px 0;
    }
    nav ul {
        display: none;
        flex-direction: column;
    }
    #toggle_button:checked~ul {
        display: flex;
    }
    label[for="toggle_button"] {
        display: block;
    }
    .index_section1 p {
        font-size: 14px;
        text-align: center;
    }
}