Pada kode CSS ada satu penggunaan properti yg mana masih merupakan experimental teknologi pada browser engine yaitu property calc() Untuk lebih jelasnya silahkan sobat baca referensi di web developer terdekat :D

.select {
position: relative;
display: inline-block;
overflow: hidden;
}
.select .label {
padding: .5em;
color: #333;
font-size: 16px;
}
.select > label {
display: block;
cursor: pointer;
border-radius: 3px;
border: 1px solid rgba(153,153,153,.7);
border-bottom-color: rgba(153,153,153,.5);
padding: .5em calc(35% + 3em) .5em 0;
background-image: linear-gradient(rgba(0,0,0,0),rgba(0,0,0,.2));
}
.select > label .label {
white-space: nowrap;
}
.select > label .label:after {
content: "";
top: 1em;
right: .5em;
position: absolute;
transition: .1s linear top;
border: .5em solid transparent;
border-top-color: #999;
}
.select > label:hover .label:after {
top: 1em;
}
.select > label:hover {
background-image: linear-gradient(rgba(0,0,0,.2),rgba(0,0,0,0));
}
.select:hover > label {
background-image: linear-gradient(rgba(0,0,0,.2), rgba(0,0,0,0));
}
.select .options {
margin: 0;
padding: 0;
background: #ddd;
height: 0;
transition: .3s linear height;
max-height: 200px;
overflow-y: auto;
}
.select .options:hover {
height: auto;
border-bottom: 1px solid #f00;
}
.select .options li {
list-style: none;
border-top: 1px solid #eee;
border-bottom: 1px solid #ccc;
}
.select .options li label {
color: #333;
display: block;
cursor: pointer;
text-align: left;
padding: .4em .5em;
transition: .2s linear all;
}
.select .options li label:hover {
background-image: linear-gradient(rgba(0,0,0,.1),rgba(0,0,0,0));
}
.select .options li:nth-child(1) label:hover {
background-image: linear-gradient(rgba(0,0,0,0),rgba(0,0,0,.1));
}
.select .options li:nth-last-child(1) {
border-bottom: none;
}
.select .options li [type="radio"] {
display: none;
}
.select .options li [type="radio"]:checked ~ label {
cursor: default;
border-left: .4em solid #f00;
}
.select .options li [type="radio"]:checked ~ label:after {
content: attr(data-title);
display: block;
position: absolute;
top: .56em;
right: .5em;
border-radius: 1em;
box-shadow: inset 0 0 .3em rgba(0,0,0,.7);
padding: .3em 1em;
background: #777;
color: #fff;
pointer-events: none;
font-size: 80%;
max-width: 30%;
text-overflow: ellipsis;
white-space: nowrap;
overflow: hidden;
}
.select #if-focus {
position: absolute;
display: block;
top: -999px;
}
.select #if-focus:focus ~ label span.label:after {
border-top-color: transparent;
border-bottom-color: #999;
top: .3em;
}
.select #if-focus:focus ~ .options {
height: auto;
border-bottom: 1px solid #aaa;
}
position: relative;
display: inline-block;
overflow: hidden;
}
.select .label {
padding: .5em;
color: #333;
font-size: 16px;
}
.select > label {
display: block;
cursor: pointer;
border-radius: 3px;
border: 1px solid rgba(153,153,153,.7);
border-bottom-color: rgba(153,153,153,.5);
padding: .5em calc(35% + 3em) .5em 0;
background-image: linear-gradient(rgba(0,0,0,0),rgba(0,0,0,.2));
}
.select > label .label {
white-space: nowrap;
}
.select > label .label:after {
content: "";
top: 1em;
right: .5em;
position: absolute;
transition: .1s linear top;
border: .5em solid transparent;
border-top-color: #999;
}
.select > label:hover .label:after {
top: 1em;
}
.select > label:hover {
background-image: linear-gradient(rgba(0,0,0,.2),rgba(0,0,0,0));
}
.select:hover > label {
background-image: linear-gradient(rgba(0,0,0,.2), rgba(0,0,0,0));
}
.select .options {
margin: 0;
padding: 0;
background: #ddd;
height: 0;
transition: .3s linear height;
max-height: 200px;
overflow-y: auto;
}
.select .options:hover {
height: auto;
border-bottom: 1px solid #f00;
}
.select .options li {
list-style: none;
border-top: 1px solid #eee;
border-bottom: 1px solid #ccc;
}
.select .options li label {
color: #333;
display: block;
cursor: pointer;
text-align: left;
padding: .4em .5em;
transition: .2s linear all;
}
.select .options li label:hover {
background-image: linear-gradient(rgba(0,0,0,.1),rgba(0,0,0,0));
}
.select .options li:nth-child(1) label:hover {
background-image: linear-gradient(rgba(0,0,0,0),rgba(0,0,0,.1));
}
.select .options li:nth-last-child(1) {
border-bottom: none;
}
.select .options li [type="radio"] {
display: none;
}
.select .options li [type="radio"]:checked ~ label {
cursor: default;
border-left: .4em solid #f00;
}
.select .options li [type="radio"]:checked ~ label:after {
content: attr(data-title);
display: block;
position: absolute;
top: .56em;
right: .5em;
border-radius: 1em;
box-shadow: inset 0 0 .3em rgba(0,0,0,.7);
padding: .3em 1em;
background: #777;
color: #fff;
pointer-events: none;
font-size: 80%;
max-width: 30%;
text-overflow: ellipsis;
white-space: nowrap;
overflow: hidden;
}
.select #if-focus {
position: absolute;
display: block;
top: -999px;
}
.select #if-focus:focus ~ label span.label:after {
border-top-color: transparent;
border-bottom-color: #999;
top: .3em;
}
.select #if-focus:focus ~ .options {
height: auto;
border-bottom: 1px solid #aaa;
}
Untuk merubah lebar, sobat cari kode .select > label dan lakukan perubahan nominal di properti
<div class="select">
<input type="radio" name="fruit" id="if-focus" tabindex="0">
<label for="if-focus">
<span class="label">You choice: </span>
</label>
<ul class="options">
<li>
<input id="pepaya" type="radio" name="fruit" value="Pepaya" tabindex="0"/>
<label for="pepaya" data-title="Pepaya">Pepaya</label>
</li>
<li>
<input id="mangga" type="radio" name="fruit" value="Mangga" tabindex="0"/>
<label for="mangga" data-title="Mangga">Mangga</label>
</li>
<li>
<input id="pisang" type="radio" name="fruit" value="Pisang" tabindex="0"/>
<label for="pisang" data-title="Pisang">Pisang</label>
</li>
<li>
<input id="ket" type="radio" name="fruit" value="" tabindex="0"/>
<label for="ket" data-title="Ada di pasar minggu.">Pasar....</label>
</li>
</ul>
</label>
</div>
<input type="radio" name="fruit" id="if-focus" tabindex="0">
<label for="if-focus">
<span class="label">You choice: </span>
</label>
<ul class="options">
<li>
<input id="pepaya" type="radio" name="fruit" value="Pepaya" tabindex="0"/>
<label for="pepaya" data-title="Pepaya">Pepaya</label>
</li>
<li>
<input id="mangga" type="radio" name="fruit" value="Mangga" tabindex="0"/>
<label for="mangga" data-title="Mangga">Mangga</label>
</li>
<li>
<input id="pisang" type="radio" name="fruit" value="Pisang" tabindex="0"/>
<label for="pisang" data-title="Pisang">Pisang</label>
</li>
<li>
<input id="ket" type="radio" name="fruit" value="" tabindex="0"/>
<label for="ket" data-title="Ada di pasar minggu.">Pasar....</label>
</li>
</ul>
</label>
</div>
Source by: cdpn.io/gqdCi
Happy select \m/
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