CSS : corner cut div , filled and border - html

Question

I trying to create this two corner cut div, one is filled , another is border, both with shadow.
However I facing an issue, which is for border shape corner, I unable to create border with corner cut.
I appreciate with any other idea to create this kind of filled shape and border shape.
.buttongroup {
display: -webkit-box;
display: -ms-flexbox;
display: flex;
-webkit-box-align: center;
-ms-flex-align: center;
align-items: center;
}
.buttongroup .gap {
width: 30px;
-webkit-box-flex: 0;
-ms-flex: none;
flex: none;
}
.neonbutton {
display: -webkit-inline-box;
display: -ms-inline-flexbox;
display: inline-flex;
width: 100%;
position: relative;
}
.neonbutton .l {
width: 100%;
height: auto;
background-color: #37E8FC;
}
.neonbutton .r {
display: -webkit-box;
display: -ms-flexbox;
display: flex;
-webkit-box-orient: vertical;
-webkit-box-direction: normal;
-ms-flex-direction: column;
flex-direction: column;
-webkit-box-align: start;
-ms-flex-align: start;
align-items: flex-start;
width: 30px;
-webkit-box-flex: 0;
-ms-flex: none;
flex: none;
}
.neonbutton .corner {
width: 0;
height: 0;
border-style: solid;
border-width: 25px 0 0 30px;
border-color: transparent transparent transparent #37E8FC;
}
.neonbutton .square {
height: 30px;
width: 30px;
background-color: #37E8FC;
}
.neonbutton .value {
position: absolute;
width: 100%;
height: 100%;
text-align: center;
color: #000;
display: -webkit-box;
display: -ms-flexbox;
display: flex;
-webkit-box-align: center;
-ms-flex-align: center;
align-items: center;
-webkit-box-pack: center;
-ms-flex-pack: center;
justify-content: center;
font-size: 17px;
font-weight: bold;
}
.neonbutton.outline .l {
background-color: transparent;
border: 2px solid #37E8FC;
border-right: none;
}
.neonbutton.outline .corner {
background-color: transparent;
}
.neonbutton.outline .square {
background-color: transparent;
border-right: 2px solid #37E8FC;
border-bottom: 2px solid #37E8FC;
}
<div class="buttongroup">
<div class="neonbutton">
<div class="l"></div>
<div class="r">
<div class="corner"></div>
<div class="square"></div>
</div>
<div class="value">Lorem</div>
</div>
<div class="gap"></div>
<div class="neonbutton outline">
<div class="l"></div>
<div class="r">
<div class="corner"></div>
<div class="line"></div>
<div class="square"></div>
</div>
<div class="value">Lorem</div>
</div>
</div>

Answer 1

I would do the first one like below:
.box {
--c:20px; /* control the cut */
font-size: 25px;
padding: 10px 30px;
display: inline-block;
position: relative;
z-index: 0;
filter: drop-shadow(0 0 5px #37E8FC)
}
.box:before {
content: "";
position: absolute;
z-index: -1;
inset: 0;
background: #37E8FC;
clip-path: polygon(0 0, calc(100% - var(--c)) 0, 100% var(--c), 100% 100%, 0 100%);
}
body {
background: #000;
}
<div class="box">some text</div>
And the second one:
.box {
--b:5px; /* control the border */
--c:20px; /* control the cut */
font-size: 25px;
padding: 10px 30px;
display: inline-block;
position: relative;
color:#fff;
z-index: 0;
filter: drop-shadow(0 0 5px #37E8FC)
}
.box:before {
content: "";
position: absolute;
z-index: -1;
inset: 0;
background: linear-gradient(to bottom left, #37E8FC 50%,#0000 50.5%) 100% 0/calc(var(--c) - 0.3*var(--b)) calc(var(--c) - 0.3*var(--b)) no-repeat;
border:var(--b) solid #37E8FC;
clip-path: polygon(0 0, calc(100% - var(--c)) 0, 100% var(--c), 100% 100%, 0 100%);
}
body {
background: #000;
}
<div class="box">some text</div>