form.css

* {
    margin: 0;
    padding: 0;
}

a {
    text-decoration: none;
}

li {
    list-style: none;
}

body {
    font-family: 'Montserrat', sans-serif;
}

.page__form {
    padding-top: 100px;
    margin-left: 5%;
    margin-right: 5%;
}

.page__title {
    font-size: 48px;
    font-weight: 600;
    position: relative;
    height: max-content;
}

.page__title::before {
    content: "";
    display: block;
    width: 232px;
    height: 3px;
    background: #000;
    position: absolute;
    top: calc(100% + 5px);
}

.page__title::after {
    content: "";
    display: block;
    width: 12px;
    height: 12px;
    background: #000;
    position: absolute;
    transform: rotate(45deg);
}

.page__form-cont {
    margin-top: 40px;
    display: flex;
    flex-flow: column;
    width: 100%;
}

.form__text-input ~ input {
    width: 100%;
    height: 28px;
    border: none;
    background: #E5E5E5;
    padding-left: 8px;
    box-sizing: border-box;
}

.form__rb-cont {
    display: flex;
    flex-flow: row;
}

.form__rb {
    margin-right: 20px;
}

.form__done {
    margin-top: 18px;
    display: flex;
    flex-flow: column;
    align-items: center;
    justify-content: center;
}

.form__done-text, .form__done-value {
    font-size: 18px;
}

.form__done-value {
    font-weight: 600;
}

.form__done-button {
    display: block;
    width: 230px;
    margin-top: 14px;
    padding: 3px 0px;
    background: #FCDA7C;
    height: max-content;
    text-align: center;
    color: black;
    font-weight: 600;
    font-size: 18px;
    border: none;
    cursor: pointer;
    transition: 0.2s ease-out;
}

.form__done-button:focus {
    outline: none;
}

.form__done-button:hover {
    background: #E5E5E5;
    transition: 0.2s ease-in;
}

.form__done-text {
    display: flex;
    flex-flow: column;
    align-items: center;
}

.form__text-input, .form__rb-title {
    margin-top: 14px;
}

.form__rb-title {
    margin-bottom: 4px;
}

@media screen and (max-width: 600px) {
    .form__rb-cont {
        flex-flow: column;
    }
    .form__rb {
        margin-top: 14px;
    }
}