CSS Drop Shadow effect not displaying correctly - html

Question

I am creating a button with a drop shadow effect (neumorphism) but when I apply my CSS to the button is just appears as a 2 toned solid button...Which part of the CSS am I using incorrectly? Are my drop shadow values wrong relative to the size of the button? Changing the width and height doesn't help.
.css-test {
background: #EAF0F8;
mix-blend-mode: normal;
border: 0.5px solid #FFFFFF;
box-shadow: 0px -30px 60px rgba(167, 179, 190, 0.35), 0px 30px 60px rgba(167, 179, 190, 0.35);
border-radius: 35px;
}
.buysellbutton {
width: 44px;
height: 44px;
background: #F0F0F3;
box-shadow: -10px -10px 30px 40% #FFFFFF, 10px 10px 30px rgba(174, 174, 192, 0.4);
border-radius: 16px;
}
<div class="css-test">
<h3> Cash Flow: <span>CSS TEST</span></h3>
<button class="buysellbutton">buy</button>
</div>

Answer 1

to remove black border from button just add broder-style:none to button. Added one more button with hover and active styling.
for creating Neumorphism effect you can check https://neumorphism.io/
.css-test {
background: #EAF0F8;
mix-blend-mode: normal;
border: 0.5px solid #FFFFFF;
box-shadow: 0px -30px 60px rgba(167, 179, 190, 0.35), 0px 30px 60px rgba(167, 179, 190, 0.35);
border-radius: 15px;
padding: 10px;
}
.buysellbutton {
width: 80px;
height: 44px;
border-style:none;
border-radius: 16px;
background: #F0F0F3;
box-shadow: 18px 18px 36px #c5c5c7,
-18px -18px 36px #ffffff;
outline:none;
}
.button {
width: 150px;
height: 50px;
background: #f3f0f1;
position: relative;
background: #f3f0f1;
margin-bottom: 25px;
border-radius: 32px;
text-align: center;
cursor: pointer;
transition: all 0.1s ease-in-out;
outline: none;
border-style: none;
box-shadow: -6px -6px 10px rgba(255, 255, 255, 0.8),
6px 6px 10px rgba(0, 0, 0, 0.2);
color: #6f6cde;
}
span {
font-size: 25px;
font-weight: semibold;
}
.button:hover {
opacity: 0.7;
box-shadow: -6px -6px 10px rgba(255, 255, 255, 0.8),
6px 6px 10px rgba(0, 0, 0, 0.2);
}
.button:active {
opacity: 1;
box-shadow: inset -4px -4px 8px rgba(255, 255, 255, 0.5),
inset 8px 8px 16px rgba(0, 0, 0, 0.1);
color: #79e3b6;
}
<div class="css-test">
<h3> Cash Flow: <span>CSS TEST</span></h3>
<button class="buysellbutton">buy</button>
<button class="button"><span>Buy</span></button>
</div>

Answer 2

First, use the below code at the top of all CSS
button{
all: unset;
}
and instead of
box-shadow: -10px -10px 30px 40% #FFFFFF, 10px 10px 30px rgba(174, 174, 192, 0.4);
use
box-shadow: -10px -10px 30px 40px #FFFFFF, 10px 10px 30px rgba(174, 174, 192, 0.4);