.keynote{
    color:red;
    font-weight: 900;
    font-size: 20px;
}
.formula{
    position: relative;
    height: 50px;
}
.coefficient{
    position: absolute;
    font-size: 20px;
    top: 5px;
}
.log_top{
    position: absolute;
    top: 0;
    left: 10px;
}
.log_bottom{
    position: absolute;
    bottom: 0;
    left: 10px;
}
.log_result{
    position: absolute;
    left: 30px;
    top: 15px;
}
.formula::after{
    content: "";
    clear: both;
    overflow: hidden;
    display: block;
}
.left_float{    
    display: inline-block;
    position: relative;
    height: 100%;
    width: 3%;
}
.right_float{
    display: inline-block;
    position: relative;
    height: 100%;
    width: 90%;
}