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1. Use border to draw a trapezoid (the content needs to be absolutely positioned)

HTML:

//左边斜边
<div class="t">
    <div class="f"></div>
</div>
//右边斜边
<div class="t2">
    <div class="f"></div>
</div>

CSS:

.t{
    position: relative;
    width: 277.5px;
    height: 35px;
    border-right: 19px solid transparent;
    border-bottom: 35px solid #4B75FF;
}
 
.f{
    position: absolute;
    bottom: 0;
}
.t2{
    position: relative;
    width: 277.5px;
    height: 35px;
    border-left: 19px solid transparent;
    border-top: 35px solid #4B75FF;
}

result:

2. Use clip-path to draw a trapezoid

HTML：

<div class="card-info_s3-bottom_cc_left">
</div>

CSS：

.card-info_s3-bottom_cc_left{
    display: flex;
    flex-direction: row;
    justify-content: flex-start;
    align-items: center;
    font-size: 13px;
    color: #ffffff;
    width: 277.5px;
    height: 35px;
    padding-left: 26px;
    clip-path:polygon(0 0,258.5px 0px,277.5px 35px,0px 35px);
    background-color: #4B75FF;
    border-bottom-left-radius: 12px;
    border-top-right-radius: 30px;
}

result:

Extension: clip-path

The clip-path property is used to define the clipping area of ​​an element to control which parts are visible and which parts are hidden. It allows you to use different functions and parameters to create complex clipping shapes. In CSS, the clip-path property can use different functions to define the clipping area. Common functions are as follows:

1. circle(): Creates a circular clipping area. The parameters are the radius and the coordinates of the center of the circle.
2. ellipse(): Creates an elliptical cropping area. The parameters are the radius of the horizontal and vertical axes and the coordinates of the center of the circle.
3. polygon(): Creates a polygonal clipping region. The parameters are the coordinates of the vertices that make up the polygon.
4. path(): Use an SVG path to define the clipping area. The parameter is a string representation of the path.