Spin button

<div class="container">
    <!-- Input -->
    <input type="text" class="container__input" />

    <!-- Buttons container -->
    <div class="container__buttons">
        <!-- Up button -->
        <button class="container__button">
            ...
        </button>

        <!-- Down button -->
        <button class="container__button">
            ...
        </button>
    </div>
</div>

.container {
                        border: 1px solid rgba(0, 0, 0, 0.3);
                        border-radius: 2px;
                        display: flex;
                    }

                    .container__input {
                        border-color: transparent;
                        margin-right: 4px;
                        padding: 4px;
                        width: 100px;
                    }

                    .container__buttons {
                        /* Content is centered vertically */
                        display: flex;
                        flex-direction: column;
                        justify-content: center;
                    }

                    .container__button {
                        border-color: transparent;
                        /* Make buttons have the same height */
                        flex: 1;
                    }

Spin button

See also

Stepper input

Voting