.btn-0 {
    cursor: pointer;
    position: relative;
    padding: 10px 20px;
    background: white;
    font-size: 28px;
    border-top-right-radius: 10px;
    border-bottom-left-radius: 10px;
    transition: all 1s;
}
.btn-0:after, .btn-0:before {
    content: " ";
    width: 10px;
    height: 10px;
    position: absolute;
    border: 0px solid #fff;
    transition: all 1s;
}
.btn-0:after {
    top: -1px;
    left: -1px;
    border-top: 5px solid yellow;
    border-left: 5px solid yellow;
}
.btn-0:before {
    bottom: -1px;
    right: -1px;
    border-bottom: 5px solid green;
    border-right: 5px solid green;
}
.btn-0:hover {
    border-top-right-radius: 0px;
    border-bottom-left-radius: 0px;
}
.btn-0:hover:before, .btn-0:hover:after {
    width: 100%;
    height: 100%;
}


.btn-1 {
    cursor: pointer;
    position: relative;
    padding: 10px 20px;
    background: white;
    font-size: 28px;
    border-top-right-radius: 10px;
    border-bottom-left-radius: 10px;
    transition: all 1s;
}
.btn-1:after, .btn-1:before {
    content: " ";
    width: 10px;
    height: 10px;
    position: absolute;
    border: 0px solid #fff;
    transition: all 1s;
}
.btn-1:after {
    top: -1px;
    left: -1px;
    border-top: 5px solid red;
    border-left: 5px solid red;
}
.btn-1:before {
    bottom: -1px;
    right: -1px;
    border-bottom: 5px solid orange;
    border-right: 5px solid orange;
}
.btn-1:hover {
    border-top-right-radius: 0px;
    border-bottom-left-radius: 0px;
}
.btn-1:hover:before, .btn-1:hover:after {
    width: 100%;
    height: 100%;
}

.btn-2 {
    cursor: pointer;
    position: relative;
    padding: 10px 20px;
    background: white;
    font-size: 28px;
    border-top-right-radius: 10px;
    border-bottom-left-radius: 10px;
    transition: all 1s;
}
.btn-2:after, .btn-2:before {
    content: " ";
    width: 10px;
    height: 10px;
    position: absolute;
    border: 0px solid #fff;
    transition: all 1s;
}
.btn-2:after {
    top: -1px;
    left: -1px;
    border-top: 5px solid green;
    border-left: 5px solid green;
}
.btn-2:before {
    bottom: -1px;
    right: -1px;
    border-bottom: 5px solid blue;
    border-right: 5px solid blue;
}
.btn-2:hover {
    border-top-right-radius: 0px;
    border-bottom-left-radius: 0px;
}
.btn-2:hover:before, .btn-2:hover:after {
    width: 100%;
    height: 100%;
}

.btn-3 {
    cursor: pointer;
    position: relative;
    padding: 10px 20px;
    background: white;
    font-size: 28px;
    border-top-right-radius: 10px;
    border-bottom-left-radius: 10px;
    transition: all 1s;
}
.btn-3:after, .btn-3:before {
    content: " ";
    width: 10px;
    height: 10px;
    position: absolute;
    border: 0px solid #fff;
    transition: all 1s;
}
.btn-3:after {
    top: -1px;
    left: -1px;
    border-top: 5px solid purple;
    border-left: 5px solid purple;
}
.btn-3:before {
    bottom: -1px;
    right: -1px;
    border-bottom: 5px solid blue;
    border-right: 5px solid blue;
}
.btn-3:hover {
    border-top-right-radius: 0px;
    border-bottom-left-radius: 0px;
}
.btn-3:hover:before, .btn-3:hover:after {
    width: 100%;
    height: 100%;
}