Toggle password visibility

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

    <!-- Toggle button sticks to the right -->
    <button>
        ...
    </button>
</div>

.container {
                        display: flex;

                        /* Border */
                        border: 1px solid rgba(0, 0, 0, 0.3);
                    }

                    .container__input {
                        border-color: transparent;
                        /* Take available width */
                        flex: 1;
                    }