:root{
    --primaryColor: #CFFFEE;
    --secColor: #121826;
    --width: 20rem;
    --transitionTime: 0.2s;
}
*{
    margin:0;
    padding:0;
    box-sizing: border-box;
}
body{
    background: black;
}
header{
    position: sticky;
    top: 0;
    font-family: Courier, Georgia, Cambria;
    color: lavender;
    background: var(--secColor);
    box-shadow: 0 0 0.6rem inset #d7b4f3;
    font-size: 3rem;
    text-align: center;
    font-weight: bold;
    z-index: 2;
}
main{
    margin-top: 1rem;
    margin-bottom: 1rem;
    display: flex;
    flex-wrap: wrap;
    justify-content: space-evenly;
    font-size: 1.3rem;
    font-weight: bold;
    row-gap: 1.5rem;
}
.card{
    width: 30%;
    height: fit-content;
    display: flex;
    flex-direction: column;
    align-items: flex-end;
    transition: all var(--transitionTime);
}
.anchor{
    position: relative;
    border: 2px solid cyan;
    border-top: none;
    width: 100%;
    height: calc(var(--width)/6);
    display: flex;
    transition: all var(--transitionTime);
}
.anchor a{
    position: relative;
    width: 100%;
    height: 100%;
    text-decoration: none;
    text-align: center;
    font-family: 'Courier New', Courier, monospace;
    color: lavender;
    background-color: var(--secColor);
    transition: all var(--transitionTime);
}
.thumbnail{
    aspect-ratio: 3/2;
    width: 100%;
    /* height: calc(var(--width)*5/6); */
    background: #CFFFEE;
    background-repeat: no-repeat;
    /* background-position: center; */
    background-size: cover;
    border: 2px solid magenta;
    border-bottom: 2px solid cyan;
}
.thumbnail a{
    display: inline-block;
    position: relative;
    width: 100%;
    height: 100%;
    background: transparent;
    cursor: default;
}
.anchor a:visited{
    color: cyan;
}
.anchor a:hover{
    background: cyan;
    color: var(--secColor);
}
.anchor:hover{
    border-color: var(--secColor);
}
.card:hover{
    transform: scale(1.03);
    box-shadow: 0 0 17px aqua;
}

#rtTriangle{
    background-image: url(../Images/MATHS/RightTriangle.jpg);
}
#circleAnim{
    background-image: url(../Images/MATHS/CircleCentralAngle.jpg);
}
#linearEqn{
    background-image: url(../Images/MATHS/LinearEqnSolver.jpg);
}
#quadEqn{
    background-image: url(../Images/MATHS/QuadEqn.jpg);
}
#linEqnXyz{
    background-image: url(../Images/MATHS/LinearEqnThree.jpg);
}
#determinant{
    background-image: url(../Images/MATHS/Determinant.jpg);
}
#unitCir{
    background-image: url(../Images/MATHS/UnitCircle.jpg);
}
#ellipse{
    background-image: url(../Images/MATHS/Ellipse.jpg);
}
#complexPlane{
    background-image: url(../Images/MATHS/ComplexPlane.jpg);
}
#rotation{
    background-image: url(../Images/MATHS/Rotation.jpg);
}
#scaling{
    background-image: url(../Images/MATHS/Scaling.jpg);
}
#translation{
    background-image: url(../Images/MATHS/Translation.jpg);
}
#pyTri{
    background-image: url(../Images/MATHS/PyTri.jpg);
}
#regression{
    background-image: url(../Images/MATHS/Regression.jpg);
}
#reflection{
    background-image: url(../Images/MATHS/Reflection.jpg);
}
#linQuad{
    background-image: url(../Images/MATHS/LinQuad.jpg);
}
#derivative{
    background-image: url(../Images/MATHS/Derivative.jpg);
}
#cirInv{
    background-image: url(../Images/MATHS/CirInversion.jpg);
}
#cirEqn{
    background-image: url(../Images/MATHS/CircleEqn.png);
}

@media (750px<=width<=950px){
    .card{
        width: 40%;
    }
}
@media (width<750px){
    .card{
        width: 80%;
    }
}
@media (width<500px){
    header{
        font-size: 2rem;
    }
}