Hi Ajeet,
I suppose that your theme does not include relevant CSS rules. The following set (.scss) comes from the Simple theme.
`
// Required by WYSIWYG editor
.align-left {
    text-align: left;
}
.align-right {
    text-align: right;
}
.align-center {
    text-align: center;
}
.align-justify {
    text-align: justify;
}
.msg {
    padding: baseline(4) baseline(8);
    &–highlight {
        background-color: #FFFCF1;
    }
    &–info {
        background: #F2F9FF;
    }
    &–success {
        background: #F7FBF6;
    }
    &–warning {
        background: #FFF3F3;
        color: #A94442;
    }
}
.ordered-list {
    counter-reset: listCounter;
    li {
        counter-increment: listCounter;
        list-style: none;
        padding-left: baseline(1);
        position: relative;
        &::before {
            color: $color;
            content: counter(listCounter, decimal-leading-zero) ‘.’;
            font-weight: $font-weight-bold;
            left: -2rem;
            position: absolute;
        }
    }
}
.dropcap {
    &:first-letter {
        color: $color-headings;
        float: left;
        font-size: ms(20);
        line-height: 0.7;
        margin-right: baseline(2);
        padding: baseline(2) baseline(2) baseline(2) 0;
    }
}
`