style.css

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body, input, select, textarea {
    font-family: 'Poppins', sans-serif;
}

body {
    background: #E5E5E5;
}

body::before {
    content: '';
    width: 100%;
    height: 436px;
    background: #535971;
    position: absolute;
    top: 0;
    left: 0;
    z-index: -1;
}

.page {
    width: 736px;
    margin: auto;
}

header {
    width: 417px;
    margin-top: 138px;
}

header h1 {
    font-weight: 400;
    font-size: 48px;
    line-height: 60px;
    color: #ffffff;
    text-transform: uppercase;
    font-family: 'Staatliches', cursive;
    margin-bottom: 18px;
}

header p {
    font-size: 20px;
    line-height: 30px;
    color: #ffffff;
    margin-bottom: 58px;
}

form {
    margin-top: 38px;
    background: #FAFAFC;
    border-radius: 20px 20px 0 0;
    min-height: 300px;
    padding: 64px;
    display: flex;
    flex-direction: column;
    gap: 48px;
}

.nome__sobrenome{
    display: flex;
    gap: 20px;
}

.nome__sobrenome > div {
    width: 50%;
}


fieldset{
    border: none;
}

.fieldset__wrapper{
    display: flex;
    flex-direction: column;
    gap: 24px;
}

fieldset legend {
    font-family: 'Staatliches', cursive;
    font-weight: 400;
    font-size: 24px;
    line-height: 34px;
    color: #535971;
    width: 100%;
    border-bottom: 1px solid #C1BCCC;
    padding-bottom: 16px;
}

.input__wrapper{
    display: flex;
    flex-direction: column;
}

.input__wrapper label {
    font-size: 14px;
    line-height: 24px;

    color: #535971;

    margin-bottom: 8px;
}

.input__wrapper label span {
    margin-left: 3px;

    font-size: 12px;
    line-height: 20px;
    
    color: #a9a7af;
}

.input__wrapper label span:hover {
    color: #6c6a71;
}

.input__wrapper input{
    background: #C1BCCC;

    border: 1px solid #E6E6F0;
    border-radius: 8px;

    height: 56px;

    padding: 0 24px;

    font-size: 16px;
    line-height: 26px;

    color: #6c6a71;
}

.col-3 {
    display: flex;
    gap: 20px;
}

.col-3 > div:nth-child(1) {
    width: 100%;
}

h3 {
    font-family: 'Staatliches', cursive;
    font-weight: 400;
    font-size: 20px;
    line-height: 1px;
    color: #535971;
    width: 100%;
}

footer {
    background: #535971;

    height: 136px;

    display: flex;
    flex-direction: column;

    padding: 40px 64px;

    margin-bottom: 100px;

    border-top: 1px solid #D6D6D6;
    border-radius: 0 0 20px 20px;
}

footer .button {
    height: 53px;
    background: #FF5374;
    border: 0;
    border-radius: 20px;
    font-family: 'Staatliches', cursive;
    font-size: 20px;
    line-height: 26px;
    color: #FFFFFF;
}

footer .button:hover {
    background: #08a04c;
}

input:invalid {
    border: 1px solid #FF1010;
}