I’ve copied the css to custom and modified the font-size that comes at 70% by default, I’ve tried with 300% and even with 300px but no effect on the size of the text.
Can someone tell me how to? I don’t want to modify de original alert.js where the font-size is 30px for the title and 22px for the message.

That’s my custom.css

.ns-box {

background: #fff;
padding: 17px;
line-height: 1.4;
margin-bottom: 10px;
z-index: 1;
color: black;
font-size: 300%;
position: relative;
display: table;
word-wrap: break-word;
max-width: 100%;
border-radius: 5px;
}

.ns-alert {
border-style: solid;
border-color: #fff;
padding: 17px;
line-height: 1.4;
margin-bottom: 10px;
z-index: 3;
color: white;
font-size: 300%;
position: fixed;
text-align: center;
right: 0;
left: 0;
margin-right: auto;
margin-left: auto;
top: 40%;
width: 40%;
height: auto;
word-wrap: break-word;
border-radius: 20px;
}