@import url('https://fonts.googleapis.com/css2?family=Source+Sans+Pro:wght@600&display=swap');

*{
    font-family: 'Source Sans Pro', sans-serif;
    letter-spacing: 4px;
    background-color: rgb(151, 151, 151);
}

.container {
display: flex;
flex-direction: row;
justify-content: space-evenly;
align-items: center;
text-align: center;
min-height: 30vh;
}

.btn-1 {
    width: 300px;
    height: 100px;
    border: none;
    color: white;
    background-color: rgb(255, 0, 0);
    border-radius: 4px;
    box-shadow: inset 0 0 0 0 #b0f906;
    transition: ease-out 0.27s;
    font-size: 2rem;
    outline: none;
}

.btn-1:hover {
    box-shadow: inset 300px 0 0 0 #f97b06;
}


.btn-2 {
    width: 300px;
    height: 100px;
    border: none;
    color: white;
    background-color: rgb(140, 0, 255);
    border-radius: 4px;
    box-shadow: inset 0 0 0 0 #1606f9;
    transition: ease-out 0.27s;
    font-size: 2rem;
    outline: none;
}

.btn-2:hover {
    box-shadow: inset 300px 0 0 0 #cf084a;
}


.btn-3 {
    width: 300px;
    height: 100px;
    border: none;
    color: white;
    background-color: rgb(0, 4, 255);
    border-radius: 4px;
    box-shadow: inset 0 0 0 0 #b406f9;
    transition: ease-out 0.27s;
    font-size: 2rem;
    outline: none;
}

.btn-3:hover {
    box-shadow: inset 300px 0 0 0 #06f9ed;
}


.btn-4 {
    width: 300px;
    height: 100px;
    border: none;
    color: white;
    background-color: rgb(157, 255, 0);
    border-radius: 4px;
    box-shadow: inset 0 0 0 0 #06f906;
    transition: ease-out 0.27s;
    font-size: 2rem;
    outline: none;
}

.btn-4:hover {
    box-shadow: inset 300px 0 0 0 #06f963;
}