.btn-otp{
    position: relative;
    left: 14px;
    top: 4px;
    height: 42px;
}
.spinner-border {
    display: inline-block;
    width: 1.5rem;
    height: 1.5rem;
    vertical-align: text-bottom;
    border: 0.25em solid currentColor;
    border-right-color: transparent;
    border-radius: 50%;
    -webkit-animation: spinner-border .75s linear infinite;
    animation: spinner-border .75s linear infinite;
}

@keyframes spinner-border {
    100% {
        -webkit-transform: rotate(
            360deg
        );
        transform: rotate(
            360deg
        );
    }
}

.otp input{
    direction: ltr;
}