cssexterno.css

* {
    box-sizing: border-box;
    outline: 0;
}
body {
    --primary-color: rgb(57, 123, 138);
    --primary-color-darker: rgb(141, 131, 131);
}

body {
    margin: 0;
    padding: 0;
    background: var(--primary-color);
    font-family: 'Open sans', sans-serif;
    font-size: 1.2em;
    line-height: 1.5em;
}

header {
    display: flex;
    flex-direction: column;
    color: rgb(255, 255, 255);
}

.header-descricao {
    display: flex;
    margin: auto;

}
header h2 {
    text-align: center;
    margin-bottom: 20px;
}


.dividindo {
    font-family: 'Times New Roman', Times, serif;
   margin-right: 25px;
   margin-left: 25px;
}
.dividindo p {
    margin-top: 10px;
    font-style: italic;
    color: rgb(15, 12, 12);
    font-size: 23px;
}
.container {
    max-width: 640px;
    margin: 10px auto;
    background: rgb(121, 58, 58);
    padding: 20px;
    border-radius: 10px;
}
form input, form label, form button {
    display: block;
    width: 100%;
    margin-bottom: 10px;
}

form input {
    font-size: 24px;
    height: 50px;
    padding: 0 20px;
}

form input:focus {
    outline: 1px solid var(--primary-color);
}

form button {
    border: none;
    background: rgb(172, 162, 162);
    color: rgb(10, 10, 10);
    font-size: 18px;
    font-weight: 700;
    height: 50px;
    cursor: pointer;
    margin-top: 30px;
}

form button:hover {
    background: rosybrown;
}
@media screen and (max-width: 780px) {
    header {
        display: flex;
        align-items: center;
        flex-direction: column;
        height: fit-content;
    }
}