bitforum-frontend/app/(auth)/approval/style.scss

#approvalForm {
    width: 100%;

    fieldset {
        position: relative;
        border: 1px solid var(--border-strong);
        border-radius: 3px;
        padding: 20px 26px;
        align-content: center;
        max-width: 430px;
        margin: 0 auto;

        > legend {
            position: absolute;
            top: -0.625rem;
            left: 1.25rem;
            padding: 0 5px;
            background: var(--bg-page);
            font-size: 1rem;
            font-weight: bold;
        }

        // 로그인 창
        > form {
            label {
                cursor: pointer;
                margin-bottom: 7px;
            }

            span em {
                font-style: normal;
            }

            // 수신된 이메일
            input[type="email"] {
                margin-bottom: 15px;
            }

            // 인증번호
            input[type="number"] {
                letter-spacing: 4px;
                -moz-appearance: textfield;

                &::-webkit-inner-spin-button,
                &::-webkit-outer-spin-button {
                    -webkit-appearance: none;
                    margin: 0;
                }

				margin-bottom: 10px;
            }

            hr {
                margin: 0.938rem 0;
            }

            // 우측 안내문구
            dl {
                dt {
                    font-weight: bold;
                    padding-bottom: 5px;
                }

                dd {
                    font-size: 0.938rem;

                    a {
                        display: inline-block;
                        padding: 0.438rem 0;
                        color: var(--text-link);
                        text-decoration: none;

                        &:hover {
                            text-decoration: underline;
                            color: var(--text-link-hover);
                        }
                    }
                }
            }
        }
    }
}

@media (max-width: 420px) {
    #approvalForm {
        fieldset {
            padding: 1rem 0 0 0;
            border: none;

            > legend {
                position: initial;
                padding: initial;
                font-size: 1rem;
                font-weight: bold;
            }

            > form {
                padding: 0;
            }
        }
    }
}

@media (max-width: 640px) {
    #approvalForm {
        fieldset {
            width: 100%;

            > form {
                padding: 1rem 0;
            }
        }
    }
}