.container1 {
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 20vh;
}

.input {
    width: 40px;
    border: none;
    border-bottom: 3px solid rgba(0, 0, 0, 0.5);
    margin: 0 10px;
    text-align: center;
    font-size: 36px;
    cursor: not-allowed;
    pointer-events: none;
}

    .input:focus {
        border-bottom: 3px solid orange;
        outline: none;
    }

    .input:nth-child(1) {
        cursor: pointer;
        pointer-events: all;
    }